1. University of Tsukuba, Tsukuba,
2. Sapporo Medical University, Sapporo,
3. Hitachi General Hospital, Hitachi,
4. Mito Saiseikai General Hospital, Mito,
5. Ibaraki Prefectural General Hospital, Tomobe,
6. University of Tokyo, Tokyo,
7. Yokohama City University, Yokohama,
8. Hamamatsu University, School of Medicine, Hamamatsu,
9. Nagoya Dai‐ni Red Cross Hospital, Nagoya,
10. Nara Medical University, Nara,
11. Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka,
12. Okayama University, Okayama,
13. Kyushu University, Fukuoka and
14. Ibaraki Prefectural University of Health Sciences, Ami, Japan