Rikako Shimizu, Kosuke Ishizuka, Kagami Kobayakawa, Taiju Miyagami, Mizue Saita, Hirotake Uchikado, Tomoki Yamada, Tomoya Sakama, Akihiko Kusakabe, Mitsuyasu Ohta, Toshio Naito. "Online search interest in major depressive disorder: Infodemiology study using the most visited search engine in Japan." PLoS ONE, 2026. doi:10.1371/journal.pone.0349091