Prophylactic acetaminophen or ibuprofen result in equivalent acute mountain sickness incidence at high altitude: a prospective randomized trial by Kanaan, N, Peterson, A, Pun, M, Holck, P, Starling, J, Basyal, B, Freeman, T, Gehner, J, Keyes, L, Levin, D, O'Leary, C, Stuart, K, Thapa, G, Tiwari, A, Velgersdyk, J, Zafren, K, Basnyat, B