False-positive tricyclic antidepressant results in diphenhydramine overdose: a report of two cases and a literature review. - Ito R; Kobayashi S; Terashima H; Hanawa T; Kinumaki A; Kanda S; Otsuka S; Kaizaki-Mitsumoto A; Numazawa S; Harita Y (BMC neurology, 2026)