Izquierdo Mikel, Morley John E, Lucia Alejandro
Navarrabiomed, Complejo Hospitalario de Navarra-Public University of Navarra, Pamplona, Navarra, Spain
CIBER of Frailty and Healthy Ageing, Instituto de Salud Carlos III, Madrid, Spain.
BMJ. 2020 Feb 5;368:m402. doi: 10.1136/bmj.m402.