Keyes LE, Mather L, Duke C, Regmi N, Phelan B, Pant S, Starling J, McElwee M, Cole D, McConnell T, Paudel P, Sallade TD, Sheets A, Twillman D, Young DS, Basnyat B. Older age, chronic medical conditions and polypharmacy in Himalayan trekkers in Nepal: an epidemiologic survey and case series. J Travel Med. 2016 Jun; 23(6).