Faktor-Faktor yang Mempengaruhi Kualitas Hidup Pada Mahasiswa S1 Reguler Fakultas Kesehatan Masyarakat Universitas Indonesia di Masa Pandemi COVID-19 Tahun 2021 = Factors Affecting Quality of Life in Regular Undergraduate Students of the Faculty of Public Health, University of Indonesia during the 2021 COVID-19 Pandemic