Sarda SP, Heyes A, Bektas M, Thankur T, Chao W, Intorcia M, Wronski S, Jones DL. Humanistic and economic burden of geographic atrophy: a systematic literature review. Clin Opththa. 2021 Dec 8;2021(15):4629-44.
Evans C, Katz N, Simon L, Bombardier C, West C, Robbins J, Copley-Merriman K, Coombs J. Development and preliminary validation of a responder index for patients with chronic low back pain. J Pain. 2006 Apr;7(4 (Supplement)):S84. doi: 10.1016/j.jpain.2006.01.341