Geographical variation in high-impact chronic pain and psychological associations at the regional level: a multilevel analysis of a large-scale internet-based cross-sectional survey - Wakaizumi, Kenta; Tanaka, Chisato; Shinohara, Yuta; Wu, Yihuan; Takaoka, Saki; Kawate, Morihiko; Oka, Hiroyuki; Matsudaira, Ko (Frontiers in Public Health, 2024)