Bosch-Capblanch X, Lavis JN, Lewin S, Atun R, Røttingen JA, Dröschel D, Beck L, Abalos E, El-Jardali F, Gilson L, Oliver S, Wyss K, Tugwell P, Kulier R, Pang T, Haines A.
PLoS Med. 2012;9(3):e1001185. doi: 10.1371/journal.pmed.1001185. Epub 2012 Mar 6.