The influence of pneumococcal positivity on clinical outcomes among patients hospitalized with COVID-19: A retrospective cohort study - Chang-Seok Yoon; Ha-Young Park; Hwa-Kyung Park; Jae-Kyeong Lee; Bo-Gun Kho; Hong-Joon Shin; Yong-Soo Kwon; Yu-Il Kim; Sung-Chul Lim; Tae-Ok Kim (PLoS ONE, 2025)