Sleep-wake functioning along the cancer continuum: focus group results from the Patient-Reported Outcomes Measurement Information System (PROMIS(®)).
Flynn KE, Shelby RA, Mitchell SA, Fawzy MR, Hardy NC, Husain AM, Keefe FJ, Krystal AD, Porter LS, Reeve BB, et al. Psychooncology. 2010 Oct; 19(10):1086-93.