1. Instituto de Investigaciones de la Altura, Facultad de Medicina Alberto Hurtado, Universidad Peruana Cayetano Heredia, Lima, Peru.
2. Johns Hopkins Sleep Center and Center for Interdisciplinary Sleep Research Education, Baltimore, Maryland, USA.
3. Hospital Cayetano Heredia, Lima, Perú.
4. Johns Hopkins School of Medicine, Baltimore, Maryland, USA.
5. Adjunct Professor, Perelman School of Medicine, University of Pennsylvania, Lima, Perú.
6. Distinguished Visiting Professor, Universidad Peruana Cayetano Heredia, Lima, Perú.