title: Shedding light on the gray zone.
authors: Department of Cardiology, Miyoshi Central Hospital Miyoshi City, Hiroshima, Japan ;
authors: Haruki
authors: H
authors: Tanaka
authors: Department of Cardiology, Hiroshima Red Cross Hospital & Atomic-bomb Survivors Hospital, Hiroshima, Japan ;
authors: Takenori
authors: T
authors: Okada
authors: Department of Cardiovascular Medicine, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
authors: Yasuki
authors: Y
authors: Kihara