[1] Unnan City Hosp, Community Care, 96-1 Iida,Daito Cho, Unnan, Shimane 6991221, Japan
[2] Community Nurse Co, 422 Satokata,Kisuki Cho, Unnan, Shimane 6991311, Japan
[3] Univ Tokyo, Grad Sch Med, Sch Social Med, Doctoral Program, 17 Chome 3-1 Hongo, Bunkyo City, Tokyo 1138654, Japan
[4] Shimane Univ, Fac Law & Literature, Dept Law & Econ, 1060 Nishikawatsu Cho, Matsue, Shimane 6908504, Japan
[5] Shimane Univ, Fac Med, Dept Community Med Management, 89-1 Enya Cho, Izumo, Shimane 6938501, Japan