Gambaran tingkat Pengetahuan, sikap dan keterampilan tentang pencegahan Covid-19 berdasarkan karakteristik petugas kebersihan dan keamanan di Universitas Indonesia = Description of Knowledge, Attitudes, and Skills Levels About COVID-19 Prevention Based on the Characteristics of Cleaning and Security Officers at the University of Indonesia, Depok An Overview of Knowledge, Attitudes and Skills Levels About Covid-19 Pre