[1] Hiroshima City Gen Rehabil Ctr, Dept Dent, Hiroshima, Japan
[2] Hiroshima Univ, Grad Sch Biomed Sci, Dept Adv Prosthodont, Hiroshima, Japan
[3] Nippon Dent Univ Tokyo, Grad Sch Life Dent, Div Oral Rehabil, Tokyo, Japan
[4] Kyoto Prefectural Univ Med, Sch Nursing, Kyoto, Japan