Etiology and clinical course of severe and extreme thrombocytosis in children: a retrospective single-center study. - Kishimoto, Kenji; Hasegawa, Daiichiro; Nakagishi, Yasuo; Kurosawa, Hiroshi; Tanaka, Toshikatsu; Hatakeyama, Tadashi; Oshima, Yoshihiro; Kosaka, Yoshiyuki (European Journal of Pediatrics, 2024)