1. Laboratory of Cardiorespiratory Control; Center of Biomedical Research; Universidad Autónoma de Chile; Santiago Chile
2. Department of Cellular and Integrative Physiology; University of Nebraska Medical Center; Omaha NE USA
3. Department of Physiology and Pharmacology; Des Moines University; Des Moines IA USA
4. Centro de Fisiología Celular e Integrativa; Facultad de Medicina, Clínica Alemana-Universidad del Desarrollo; Santiago Chile