An eHealth Intervention to Improve Quality of Life, Socioemotional, and Health-Related Measures Among Older Adults With Multiple Chronic Conditions: Randomized Controlled Trial - David H Gustafson Sr; Marie-Louise Mares; Darcie Johnston; Olivia J Vjorn; John J Curtin; Gina Landucci; Klaren Pe-Romashko; David H Gustafson Jr; Dhavan V Shah (JMIR Aging)