1. Shimane Institute of Health Science, Izumo, Japan.
2. Department of Human Behavioral Science, School of Medicine, Tohoku University, Sendai, Japan.
3. Okinawa Chubu Hospital, Gushikawa, Japan.
4. Izumo Citizens Hospital, Izumo, Japan.
5. Department of Pediatrics, School of Medicine, Nagasaski University, Nagasaki, Japan.