1. Isabel Ruiz-Perez, Guadalupe Pastor-Moreno, and Miguel Rodríguez-Barranco are with the Andalusian School of Public Health, Granada, Spain. Isabel Ruiz-Perez and Miguel Rodríguez-Barranco are also with CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain. Matthew Murphy is with the Department of Internal Medicine, Alpert School of Medicine, Brown University, Providence, RI. Antonio Rojas-García is with the Department of Applied Health Research, University College London, London, England.