Online search interest in major depressive disorder: Infodemiology study using the most visited search engine in Japan. - Shimizu, Rikako; Ishizuka, Kosuke; Kobayakawa, Kagami; Miyagami, Taiju; Saita, Mizue; Uchikado, Hirotake; Yamada, Tomoki; Sakama, Tomoya; Kusakabe, Akihiko; Ohta, Mitsuyasu; Naito, Toshio (PLoS ONE, 2026)