[1] Hiroshima Red Cross & Atom Bomb Survivors Hosp, Dept Oral Surg, Senda Machi 1-9-6,Naka Ku, Hiroshima, Hiroshima 7300052, Japan
[2] Hiroshima Univ, Writing Ctr, Kagamiyama 1-3-2, Hiroshima, Hiroshima 7398511, Japan
[3] Hiroshima Univ Hosp, Dept Clin Engn, 1-2-3 Kasumi,Minami Ku, Hiroshima, Hiroshima 7340037, Japan
[4] Hiroshima Red Cross & Atom bomb Survivors Hosp, Dept Oral Surg, Senda Machi,Naka Ku, Hiroshima 7300052, Japan