Identification of Risk Psychosocial Factors as Predictors of Loneliness of Elderly in Nursing Homes During Social Isolation Due to COVID-19 Pandemic Ivona Bulka, Željko Mudri, Robert Lovrić, Mirjana Kralj, Jasenka Vujanić, Matej Solić, Štefica Mikšić, Aleksandar Včev, Jelena Jakab • 2021