1. 1) Shinoda R (l967) Introduction of Marine Medicine. Maritime Medicine 26, 4-32.
2. 2) Ministry of Land, Infrastructure and Transport (1986) The Statistical Report on Seamen. Available at http://toukei.mlit.go.jp/search/pdf/02/02198600ab0000.pdf (in Japanese) (Accessed May 1, 2005).
3. 3) Ministry of Land, Infrastructure and Transport (2000) The Statistical Report on Seamen. Available at http://toukei.mlit.go.jp/search/pdf/02/02200000ab0000.pdf (in Japanese) (Accessed May 1, 2005).
4. 4) Kato K, Hisamune S (2000) Mental Health, Life Style, and Work Environment Among Seamen ('99 1st Report) Maritime Labor Research Institute, Tokyo (in Japanese).
5. 5) The Mercantile Marine Institute of Japan (1984) Consciousness of living and work among seamen working in deep sea fisheries. The Mercantile Marine Institute of Japan, Tokyo (in Japanese, title tentatively translated).