Korean medicine registry for cognitive disorder: A protocol for prospective observational multi-center study - Hanbit Jin; Do-Eun Lee; Moon Joo Cheong; Hyungsun Jun; Taena Eom; Seojae Jeon; Dong-Hoon Kang; Hye-Jeong KooK; Daeun Lee; In Chul Jung; Jungtae Leem; Hyung Won Kang (PLoS ONE, 2025)