Cardona Jiménez, Jairo León, María Mercedes Villamil Gallego, Eucaris Henao Villa, and Ángela Quintero Echeverri. 2013. “Loneliness in Older Adults”. Medicina UPB 32 (1): 9-19. https://revistas.upb.edu.co/index.php/medicina/article/view/1584.