Danysh HE, Gilman RH, Wells JC, Pan WK, Zaitchik B, Gonzalvez G, Alvarez M, Checkley W. El Niño adversely affected childhood stature and lean mass in northern Peru. Climate Change Responses. 2014;1(7). doi: 10.1186/s40665-014-0007-z
Derby CA, Araujo AB, Johannes CB, Feldman HA, McKinlay JB. Measurement of erectile dysfunction in population-based studies: the use of a single question self-assessment in the Massachusetts Male Aging Study. Int J Impot Res. 2000 Aug 1;12(4):197-204.