The Korean medicine for aging cohort (KoMAC) study: A protocol for a prospective, multicenter cohort study on healthy aging in the population entering old age in South Korea - Mi Mi Ko; Seojae Jeon; Wonbae Ha; Young-Eun Kim; So Young Jung; Bo-Young Kim; Myunghwa Kim; Kwang-Ho Choi; Geonhui Kang; So Min Lee; You Mee Ahn; Nahyun Cho; et al. (PLoS ONE, 2025)