1 Epidemiology Unit, Health Research Institute-Fundación Jiménez Díaz University Hospital, Universidad Autónoma de Madrid, Avda. Reyes Católicos 2, E-28040 Madrid, Spain. Electronic address: rafael.dalre@quironsalud.es.
2 Division of Medical Ethics, Grossman School of Medicine, NYU Langone Medical Center, 550 1st Ave., New York, NY 10016, United States.
3 Centre for Biomedical Ethics, Yong Loo Lin School of Medicine, Clinical Research Centre, National University of Singapore, 21 Lower Kent Ridge Rd 117597, Block MD11, #02-03, 10 Medical Drive, Singapore 119077, Singapore.