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.
Phanikumar CV, Maitra B. Modeling willingness-to-pay values for rural bus attributes under different trip purposes. JTRF. 2006;45(2):31-44. doi: 10.22004/ag.econ.206787