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Items: 1 to 50 of 87

1.

Individual opioids, and long- versus short-acting opioids, for chronic noncancer pain: Protocol for a network meta-analysis of randomized controlled trials.

Noori A, Busse JW, Sadeghirad B, Siemieniuk RA, Wang L, Couban R, Juurlink DN, Thabane L, Guyatt GH.

Medicine (Baltimore). 2019 Oct;98(43):e17647. doi: 10.1097/MD.0000000000017647.

2.

Colorectal cancer screening with faecal immunochemical testing, sigmoidoscopy or colonoscopy: a clinical practice guideline.

Helsingen LM, Vandvik PO, Jodal HC, Agoritsas T, Lytvyn L, Anderson JC, Auer R, Murphy SB, Almadi MA, Corley DA, Quinlan C, Fuchs JM, McKinnon A, Qaseem A, Heen AF, Siemieniuk RAC, Kalager M, Usher-Smith JA, Lansdorp-Vogelaar I, Bretthauer M, Guyatt G.

BMJ. 2019 Oct 2;367:l5515. doi: 10.1136/bmj.l5515.

3.

Development of the summary of findings table for network meta-analysis.

Yepes-Nuñez JJ, Li SA, Guyatt G, Jack SM, Brozek JL, Beyene J, Murad MH, Rochwerg B, Mbuagbaw L, Zhang Y, Flórez ID, Siemieniuk RA, Sadeghirad B, Mustafa R, Santesso N, Schünemann HJ.

J Clin Epidemiol. 2019 Nov;115:1-13. doi: 10.1016/j.jclinepi.2019.04.018. Epub 2019 May 2.

PMID:
31055177
4.

Minimal important differences for improvement in shoulder condition patient-reported outcomes: a systematic review to inform a BMJ Rapid Recommendation.

Hao Q, Devji T, Zeraatkar D, Wang Y, Qasim A, Siemieniuk RAC, Vandvik PO, Lähdeoja T, Carrasco-Labra A, Agoritsas T, Guyatt G.

BMJ Open. 2019 Feb 20;9(2):e028777. doi: 10.1136/bmjopen-2018-028777.

5.

Subacromial decompression surgery for adults with shoulder pain: a clinical practice guideline.

Vandvik PO, Lähdeoja T, Ardern C, Buchbinder R, Moro J, Brox JI, Burgers J, Hao Q, Karjalainen T, van den Bekerom M, Noorduyn J, Lytvyn L, Siemieniuk RAC, Albin A, Shunjie SC, Fisch F, Proulx L, Guyatt G, Agoritsas T, Poolman RW.

BMJ. 2019 Feb 6;364:l294. doi: 10.1136/bmj.l294.

6.

Antibiotic Prophylaxis in the Management of Open Fractures: A Systematic Survey of Current Practice and Recommendations.

Chang Y, Bhandari M, Zhu KL, Mirza RD, Ren M, Kennedy SA, Negm A, Bhatnagar N, Naji FN, Milovanovic L, Fei Y, Agarwal A, Kamran R, Cho SM, Schandelmaier S, Wang L, Jin L, Hu S, Zhao Y, Lopes LC, Wang M, Petrisor B, Ristevski B, Siemieniuk RAC, Guyatt GH.

JBJS Rev. 2019 Feb;7(2):e1. doi: 10.2106/JBJS.RVW.17.00197.

PMID:
30724762
7.

The authors reply.

Oczkowski SJ, Rochwerg B, Alhazzani W, Siemieniuk RAC, Annane D, Guyatt G.

Crit Care Med. 2019 Feb;47(2):e158-e159. doi: 10.1097/CCM.0000000000003537. No abstract available.

PMID:
30653076
8.

Clopidogrel plus aspirin versus aspirin alone for acute minor ischaemic stroke or high risk transient ischaemic attack: systematic review and meta-analysis.

Hao Q, Tampi M, O'Donnell M, Foroutan F, Siemieniuk RA, Guyatt G.

BMJ. 2018 Dec 18;363:k5108. doi: 10.1136/bmj.k5108.

9.

GRADE approach to rate the certainty from a network meta-analysis: addressing incoherence.

Brignardello-Petersen R, Mustafa RA, Siemieniuk RAC, Murad MH, Agoritsas T, Izcovich A, Schünemann HJ, Guyatt GH; GRADE Working Group.

J Clin Epidemiol. 2019 Apr;108:77-85. doi: 10.1016/j.jclinepi.2018.11.025. Epub 2018 Dec 5.

PMID:
30529648
10.

The authors reply.

Rochwerg B, Oczkowski SJ, Alhazzani W, Guyatt G, Annane D, Siemieniuk RAC.

Crit Care Med. 2018 Dec;46(12):e1228-e1229. doi: 10.1097/CCM.0000000000003447. No abstract available.

PMID:
30444829
11.

Antiretroviral resistance testing in HIV-positive people.

Aves T, Tambe J, Siemieniuk RA, Mbuagbaw L.

Cochrane Database Syst Rev. 2018 Nov 9;11:CD006495. doi: 10.1002/14651858.CD006495.pub5.

12.

Oxygen therapy for acutely ill medical patients: a clinical practice guideline.

Siemieniuk RAC, Chu DK, Kim LH, Güell-Rous MR, Alhazzani W, Soccal PM, Karanicolas PJ, Farhoumand PD, Siemieniuk JLK, Satia I, Irusen EM, Refaat MM, Mikita JS, Smith M, Cohen DN, Vandvik PO, Agoritsas T, Lytvyn L, Guyatt GH.

BMJ. 2018 Oct 24;363:k4169. doi: 10.1136/bmj.k4169. No abstract available.

PMID:
30355567
13.

Prostate cancer screening with prostate-specific antigen (PSA) test: a clinical practice guideline.

Tikkinen KAO, Dahm P, Lytvyn L, Heen AF, Vernooij RWM, Siemieniuk RAC, Wheeler R, Vaughan B, Fobuzi AC, Blanker MH, Junod N, Sommer J, Stirnemann J, Yoshimura M, Auer R, MacDonald H, Guyatt G, Vandvik PO, Agoritsas T.

BMJ. 2018 Sep 5;362:k3581. doi: 10.1136/bmj.k3581. No abstract available.

14.

Prolonged low-dose methylprednisolone treatment is highly effective in reducing duration of mechanical ventilation and mortality in patients with ARDS.

Meduri GU, Siemieniuk RAC, Ness RA, Seyler SJ.

J Intensive Care. 2018 Aug 24;6:53. doi: 10.1186/s40560-018-0321-9. eCollection 2018.

15.

Corticosteroid therapy for sepsis: a clinical practice guideline.

Lamontagne F, Rochwerg B, Lytvyn L, Guyatt GH, Møller MH, Annane D, Kho ME, Adhikari NKJ, Machado F, Vandvik PO, Dodek P, Leboeuf R, Briel M, Hashmi M, Camsooksai J, Shankar-Hari M, Baraki MK, Fugate K, Chua S, Marti C, Cohen D, Botton E, Agoritsas T, Siemieniuk RAC.

BMJ. 2018 Aug 10;362:k3284. doi: 10.1136/bmj.k3284. No abstract available.

16.

Patent foramen ovale closure, antiplatelet therapy or anticoagulation in patients with patent foramen ovale and cryptogenic stroke: a systematic review and network meta-analysis incorporating complementary external evidence.

Mir H, Siemieniuk RAC, Ge L, Foroutan F, Fralick M, Syed T, Lopes LC, Kuijpers T, Mas JL, Vandvik PO, Agoritsas T, Guyatt GH.

BMJ Open. 2018 Jul 25;8(7):e023761. doi: 10.1136/bmjopen-2018-023761. Erratum in: BMJ Open. 2018 Aug 17;8(8):e023761corr1.

17.

Patent foramen ovale closure, antiplatelet therapy or anticoagulation therapy alone for management of cryptogenic stroke? A clinical practice guideline.

Kuijpers T, Spencer FA, Siemieniuk RAC, Vandvik PO, Otto CM, Lytvyn L, Mir H, Jin AY, Manja V, Karthikeyan G, Hoendermis E, Martin J, Carballo S, O'Donnell M, Vartdal T, Baxter C, Patrick-Lake B, Scott J, Agoritsas T, Guyatt G.

BMJ. 2018 Jul 25;362:k2515. doi: 10.1136/bmj.k2515. No abstract available.

18.

α-Blockers for uncomplicated ureteric stones: a clinical practice guideline.

Vermandere M, Kuijpers T, Burgers JS, Kunnamo I, van Lieshout J, Wallace E, Vlayen J, Schoenfeld E, Siemieniuk RA, Trevena L, Zhu X, Verermen F, Neuschwander B, Dahm PH, Tikkinen KAO, Aubrey-Bassler K, Vernooij RWM, Aertgeerts B, Bekkering GE.

BJU Int. 2018 Dec;122(6):924-931. doi: 10.1111/bju.14457. Epub 2018 Aug 31.

PMID:
29993174
19.

Corticosteroids in Sepsis: An Updated Systematic Review and Meta-Analysis.

Rochwerg B, Oczkowski SJ, Siemieniuk RAC, Agoritsas T, Belley-Cote E, D'Aragon F, Duan E, English S, Gossack-Keenan K, Alghuroba M, Szczeklik W, Menon K, Alhazzani W, Sevransky J, Vandvik PO, Annane D, Guyatt G.

Crit Care Med. 2018 Sep;46(9):1411-1420. doi: 10.1097/CCM.0000000000003262.

PMID:
29979221
20.

Applying GRADE to a network meta-analysis of antidepressants led to more conservative conclusions.

Bonner A, Alexander PE, Brignardello-Petersen R, Furukawa TA, Siemieniuk RA, Zhang Y, Wiercioch W, Florez ID, Fei Y, Agarwal A, Yepes-Nuñez JJ, Beyene J, Schünemann H, Guyatt GH.

J Clin Epidemiol. 2018 Oct;102:87-98. doi: 10.1016/j.jclinepi.2018.05.009. Epub 2018 May 22.

PMID:
29800689
21.

Atraumatic (pencil-point) versus conventional needles for lumbar puncture: a clinical practice guideline.

Rochwerg B, Almenawer SA, Siemieniuk RAC, Vandvik PO, Agoritsas T, Lytvyn L, Alhazzani W, Archambault P, D'Aragon F, Farhoumand PD, Guyatt G, Laake JH, Beltrán-Arroyave C, McCredie V, Price A, Chabot C, Zervakis T, Badhiwala J, St-Onge M, Szczeklik W, Møller MH, Lamontagne F.

BMJ. 2018 May 22;361:k1920. doi: 10.1136/bmj.k1920. No abstract available.

22.

Corrigendum to "Advances in the GRADE approach to rate the certainty in estimates from a network meta-analysis" [J Clin Epidemiol 2018;93:36-44].

Brignardello-Petersen R, Bonner A, Alexander PE, Siemieniuk RA, Furukawa TA, Rochwerg B, Hazlewood GS, Alhazzani W, Mustafa RA, Murad MH, Puhan MA, Schünemann HJ, Guyatt GH; GRADE Working Group.

J Clin Epidemiol. 2018 Jun;98:162. doi: 10.1016/j.jclinepi.2018.04.013. No abstract available.

PMID:
29784130
23.

Mycobacterium avium complex infection presenting as persistent ascites.

Auguste BL, Patel AD, Siemieniuk RA.

CMAJ. 2018 Apr 3;190(13):E394-E397. doi: 10.1503/cmaj.170823. No abstract available. Erratum in: CMAJ. 2018 Apr 23;190(16):E515.

24.

Arthroscopic surgery for degenerative knee arthritis and meniscal tears: a clinical practice guideline.

Siemieniuk RAC, Harris IA, Agoritsas T, Poolman RW, Brignardello-Petersen R, Van de Velde S, Buchbinder R, Englund M, Lytvyn L, Quinlan C, Helsingen L, Knutsen G, Olsen NR, Macdonald H, Hailey L, Wilson HM, Lydiatt A, Kristiansen A.

Br J Sports Med. 2018 Mar;52(5):313. doi: 10.1136/bjsports-2017-j1982rep. No abstract available.

25.

Antibiotics for uncomplicated skin abscesses: systematic review and network meta-analysis.

Wang W, Chen W, Liu Y, Siemieniuk RAC, Li L, Martínez JPD, Guyatt GH, Sun X.

BMJ Open. 2018 Feb 6;8(2):e020991. doi: 10.1136/bmjopen-2017-020991. Review.

26.

Antibiotics after incision and drainage for uncomplicated skin abscesses: a clinical practice guideline.

Vermandere M, Aertgeerts B, Agoritsas T, Liu C, Burgers J, Merglen A, Okwen PM, Lytvyn L, Chua S, Vandvik PO, Guyatt GH, Beltran-Arroyave C, Lavergne V, Speeckaert R, Steen FE, Arteaga V, Sender R, McLeod S, Sun X, Wang W, Siemieniuk RAC.

BMJ. 2018 Feb 6;360:k243. doi: 10.1136/bmj.k243. No abstract available.

27.

An Exploratory Reanalysis of the Randomized Trial on Efficacy of Corticosteroids as Rescue Therapy for the Late Phase of Acute Respiratory Distress Syndrome.

Meduri GU, Bridges L, Siemieniuk RAC, Kocak M.

Crit Care Med. 2018 Jun;46(6):884-891. doi: 10.1097/CCM.0000000000003021.

PMID:
29432350
28.

Early vasopressor use following traumatic injury: a systematic review.

Hylands M, Toma A, Beaudoin N, Frenette AJ, D'Aragon F, Belley-Côté É, Charbonney E, Møller MH, Laake JH, Vandvik PO, Siemieniuk RA, Rochwerg B, Lauzier F, Green RS, Ball I, Scales D, Murthy S, Kwong JSW, Guyatt G, Rizoli S, Asfar P, Lamontagne F.

BMJ Open. 2017 Nov 17;7(11):e017559. doi: 10.1136/bmjopen-2017-017559. Review.

29.

Evidence-based guidelines for supportive care of patients with Ebola virus disease.

Lamontagne F, Fowler RA, Adhikari NK, Murthy S, Brett-Major DM, Jacobs M, Uyeki TM, Vallenas C, Norris SL, Fischer WA 2nd, Fletcher TE, Levine AC, Reed P, Bausch DG, Gove S, Hall A, Shepherd S, Siemieniuk RA, Lamah MC, Kamara R, Nakyeyune P, Soka MJ, Edwin A, Hazzan AA, Jacob ST, Elkarsany MM, Adachi T, Benhadj L, Clément C, Crozier I, Garcia A, Hoffman SJ, Guyatt GH.

Lancet. 2018 Feb 17;391(10121):700-708. doi: 10.1016/S0140-6736(17)31795-6. Epub 2017 Oct 17.

30.

Advances in the GRADE approach to rate the certainty in estimates from a network meta-analysis.

Brignardello-Petersen R, Bonner A, Alexander PE, Siemieniuk RA, Furukawa TA, Rochwerg B, Hazlewood GS, Alhazzani W, Mustafa RA, Murad MH, Puhan MA, Schünemann HJ, Guyatt GH; GRADE Working Group.

J Clin Epidemiol. 2018 Jan;93:36-44. doi: 10.1016/j.jclinepi.2017.10.005. Epub 2017 Oct 17. Erratum in: J Clin Epidemiol. 2018 Jun;98 :162.

PMID:
29051107
31.

Corticosteroids in Patients Hospitalized With Community-Acquired Pneumonia: Systematic Review and Individual Patient Data Metaanalysis.

Briel M, Spoorenberg SMC, Snijders D, Torres A, Fernandez-Serrano S, Meduri GU, Gabarrús A, Blum CA, Confalonieri M, Kasenda B, Siemieniuk RAC, Boersma W, Bos WJW, Christ-Crain M; Ovidius Study Group; Capisce Study Group; STEP Study Group.

Clin Infect Dis. 2018 Jan 18;66(3):346-354. doi: 10.1093/cid/cix801.

PMID:
29020323
32.

Corticosteroids for treatment of sore throat: systematic review and meta-analysis of randomised trials.

Sadeghirad B, Siemieniuk RAC, Brignardello-Petersen R, Papola D, Lytvyn L, Vandvik PO, Merglen A, Guyatt GH, Agoritsas T.

BMJ. 2017 Sep 20;358:j3887. doi: 10.1136/bmj.j3887. Review.

33.

Corticosteroids for sore throat: a clinical practice guideline.

Aertgeerts B, Agoritsas T, Siemieniuk RAC, Burgers J, Bekkering GE, Merglen A, van Driel M, Vermandere M, Bullens D, Okwen PM, Niño R, van den Bruel A, Lytvyn L, Berg-Nelson C, Chua S, Leahy J, Raven J, Weinberg M, Sadeghirad B, Vandvik PO, Brignardello-Petersen R.

BMJ. 2017 Sep 20;358:j4090. doi: 10.1136/bmj.j4090. No abstract available. Erratum in: BMJ. 2017 Dec 5;359:j5654.

34.

Values and preferences of women living with HIV who are pregnant, postpartum or considering pregnancy on choice of antiretroviral therapy during pregnancy.

Lytvyn L, Siemieniuk RA, Dilmitis S, Ion A, Chang Y, Bala MM, Manja V, Mirza R, Rodriguez-Gutierrez R, Mir H, El Dib R, Banfield L, Vandvik PO, Bewley S.

BMJ Open. 2017 Sep 11;7(9):e019023. doi: 10.1136/bmjopen-2017-019023. Review. Erratum in: BMJ Open. 2018 May 14;8(5):e019023corr1.

35.

Antiretroviral therapy for pregnant women living with HIV or hepatitis B: a systematic review and meta-analysis.

Siemieniuk RA, Foroutan F, Mirza R, Mah Ming J, Alexander PE, Agarwal A, Lesi O, Merglen A, Chang Y, Zhang Y, Mir H, Hepworth E, Lee Y, Zeraatkar D, Guyatt GH.

BMJ Open. 2017 Sep 11;7(9):e019022. doi: 10.1136/bmjopen-2017-019022. Review.

36.

Antiretroviral therapy in pregnant women living with HIV: a clinical practice guideline.

Siemieniuk RAC, Lytvyn L, Mah Ming J, Mullen RM, Anam F, Otieno T, Guyatt GH, Taylor GP, Beltrán-Arroyave C, Okwen PM, Nduati R, Kinuthia J, Luma HN, Kirpalani H, Merglen A, Lesi OA, Vandvik PO, Agoritsas T, Bewley S.

BMJ. 2017 Sep 11;358:j3961. doi: 10.1136/bmj.j3961. No abstract available.

37.

Structural valve deterioration after transcatheter aortic valve implantation.

Foroutan F, Guyatt GH, Otto CM, Siemieniuk RA, Schandelmaier S, Agoritsas T, Vandvik PO, Bhagra S, Bagur R.

Heart. 2017 Dec;103(23):1899-1905. doi: 10.1136/heartjnl-2017-311329. Epub 2017 Jul 6. Review.

PMID:
28684441
38.

Corticosteroids in sepsis: an updated systematic review and meta-analysis (protocol).

Rochwerg B, Oczkowski S, Siemieniuk RA, Menon K, Szczeklik W, English S, Agoritsas T, Belley-Cote E, D'Aragon F, Alhazzani W, Duan E, Gossack-Keenan K, Sevransky J, Vandvik P, Venkatesh B, Guyatt G, Annane D.

BMJ Open. 2017 Jun 30;7(6):e016847. doi: 10.1136/bmjopen-2017-016847.

39.

A systematic review of vasopressor blood pressure targets in critically ill adults with hypotension.

Hylands M, Moller MH, Asfar P, Toma A, Frenette AJ, Beaudoin N, Belley-Côté É, D'Aragon F, Laake JH, Siemieniuk RA, Charbonney E, Lauzier F, Kwong J, Rochwerg B, Vandvik PO, Guyatt G, Lamontagne F.

Can J Anaesth. 2017 Jul;64(7):703-715. doi: 10.1007/s12630-017-0877-1. Epub 2017 May 11. Review.

PMID:
28497426
40.

The next frontier in critical care guidelines: rapid and trustworthy recommendations.

Siemieniuk RAC, Guyatt GH.

Can J Anaesth. 2017 Jul;64(7):689-692. doi: 10.1007/s12630-017-0876-2. Epub 2017 May 11. No abstract available.

PMID:
28497425
41.

Application of minimal important differences in degenerative knee disease outcomes: a systematic review and case study to inform BMJ Rapid Recommendations.

Devji T, Guyatt GH, Lytvyn L, Brignardello-Petersen R, Foroutan F, Sadeghirad B, Buchbinder R, Poolman RW, Harris IA, Carrasco-Labra A, Siemieniuk RAC, Vandvik PO.

BMJ Open. 2017 May 11;7(5):e015587. doi: 10.1136/bmjopen-2016-015587. Review.

42.

Arthroscopic surgery for degenerative knee arthritis and meniscal tears: a clinical practice guideline.

Siemieniuk RAC, Harris IA, Agoritsas T, Poolman RW, Brignardello-Petersen R, Van de Velde S, Buchbinder R, Englund M, Lytvyn L, Quinlan C, Helsingen L, Knutsen G, Olsen NR, Macdonald H, Hailey L, Wilson HM, Lydiatt A, Kristiansen A.

BMJ. 2017 May 10;357:j1982. doi: 10.1136/bmj.j1982. No abstract available.

43.

Prolonged glucocorticoid treatment in acute respiratory distress syndrome.

Meduri GU, Siemieniuk RAC.

Lancet. 2017 Apr 15;389(10078):1516. doi: 10.1016/S0140-6736(17)30952-2. No abstract available.

PMID:
28422024
44.

Cerebral Embolic Protection Devices During Transcatheter Aortic Valve Implantation: Systematic Review and Meta-Analysis.

Bagur R, Solo K, Alghofaili S, Nombela-Franco L, Kwok CS, Hayman S, Siemieniuk RA, Foroutan F, Spencer FA, Vandvik PO, Schäufele TG, Mamas MA.

Stroke. 2017 May;48(5):1306-1315. doi: 10.1161/STROKEAHA.116.015915. Epub 2017 Apr 14. Review.

PMID:
28411259
45.

Low intensity pulsed ultrasound for bone healing: systematic review of randomized controlled trials.

Schandelmaier S, Kaushal A, Lytvyn L, Heels-Ansdell D, Siemieniuk RA, Agoritsas T, Guyatt GH, Vandvik PO, Couban R, Mollon B, Busse JW.

BMJ. 2017 Feb 22;356:j656. doi: 10.1136/bmj.j656. Review.

46.

Procedure-specific Risks of Thrombosis and Bleeding in Urological Cancer Surgery: Systematic Review and Meta-analysis.

Tikkinen KAO, Craigie S, Agarwal A, Violette PD, Novara G, Cartwright R, Naspro R, Siemieniuk RAC, Ali B, Eryuzlu L, Geraci J, Winkup J, Yoo D, Gould MK, Sandset PM, Guyatt GH.

Eur Urol. 2018 Feb;73(2):242-251. doi: 10.1016/j.eururo.2017.03.008. Epub 2017 Mar 23.

47.

Authors' reply to Farrar.

Schandelmaier S, Siemieniuk RA, Agoritsas T, Vandvik PO, Guyatt GH, Busse JW.

BMJ. 2017 Mar 24;356:j1483. doi: 10.1136/bmj.j1483. No abstract available.

PMID:
28341658
48.

Procedure-specific Risks of Thrombosis and Bleeding in Urological Non-cancer Surgery: Systematic Review and Meta-analysis.

Tikkinen KAO, Craigie S, Agarwal A, Siemieniuk RAC, Cartwright R, Violette PD, Novara G, Naspro R, Agbassi C, Ali B, Imam M, Ismaila N, Kam D, Gould MK, Sandset PM, Guyatt GH.

Eur Urol. 2018 Feb;73(2):236-241. doi: 10.1016/j.eururo.2017.02.025. Epub 2017 Mar 9.

49.

Vasopressor use following traumatic injury: protocol for a systematic review.

Hylands M, Toma A, Beaudoin N, Frenette AJ, D'Aragon F, Belley-Côté E, Hylander M, Lauzier F, Siemieniuk RA, Charbonney E, Kwong J, Laake JH, Guyatt G, Vandvik PO, Rochwerg B, Green R, Ball I, Scales D, Murthy S, Rizoli S, Asfar P, Lamontagne F.

BMJ Open. 2017 Feb 28;7(2):e014166. doi: 10.1136/bmjopen-2016-014166.

50.

Low intensity pulsed ultrasound (LIPUS) for bone healing: a clinical practice guideline.

Poolman RW, Agoritsas T, Siemieniuk RA, Harris IA, Schipper IB, Mollon B, Smith M, Albin A, Nador S, Sasges W, Schandelmaier S, Lytvyn L, Kuijpers T, van Beers LW, Verhofstad MH, Vandvik PO.

BMJ. 2017 Feb 21;356:j576. doi: 10.1136/bmj.j576. Review. No abstract available.

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