1. Department of Medicine, Section Pulmonology; Cayetano Heredia Hospital; Lima Peru
2. High Altitude Institute, Alberto Hurtado Medicine Faculty; Cayetano Heredia Peruvian University; Lima Peru
3. Sections of Pediatric Sleep Medicine and Pediatric Pulmonology, Department of Pediatrics, Pritzker School of Medicine, Biological Sciences Division; The University of Chicago; Chicago Illinois USA