Mera, Robertino M; Bravo, Luis E; Camargo, M Constanza; Bravo, Juan C; Delgado, Alberto G; Romero-Gallo, Judith; Yepez, Maria C; Realpe, José L; Schneider, Barbara G; Morgan, Douglas R; Peek, Richard M; Correa, Pelayo; Wilson, Keith T; Piazuelo, M Blanca