A Proactive Testing Strategy to COVID-19 for Reopening University Campus during Omicron Wave in Korea: Ewha Safe Campus (ESC) Project - Whanhee Lee; Kyunghee Jung-Choi; Hyunjin Park; Seunghee Jun; Nackmoon Sung; Sun-Hwa Lee; Misun Chang; Hee Jung Choi; Chung-Jong Kim; Hyesook Park; Eunhee Ha (The Ewha Medical Journal)