1 Department of Medicine, Physiology, and Pharmacology and Community Health Sciences, O'Brien Institute for Public Health and Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, AB T2N 4Z6, Canada. Electronic address: ncampbel@ucalgary.ca.
2 University Hospital "General Calixto García", Havana, Cuba.
3 Pan-American Health Organization-Department of Non-Communicable Diseases and Mental Health, Pan-American Health Organization, Washington, DC, USA.