Breakthrough infections and waning immune responses with ChAdOx1 nCoV‐19 or mRNA vaccine in healthcare workers - So Yun Lim; Jiwon Jung; Ji Yeun Kim; Soonju Park; Ji‐Soo Kwon; So Yeon Park; Sun‐Kyung Kim; Young‐Ju Lim; Eun Ok Kim; Seongman Bae; Min Jae Kim; Yong Pil Chong; et al. (Clinical and Translational Medicine, 2022)