TAKEDA Yukihiko1,2, MURAYAMA Kazuyoshi1, TAMURA Ryuki1, SATO Hideaki2, NINOMIYA Kazunori2, TANAKA Akira3, TONAI Iwai4
(1.Dept. of OMS, Niigata Prefectural Central Ho Spital, Joetsu, Japan, 2.Dept. of OMS, the Nippon Dental Univ. N Iigata Hospital, Niigata, Japan, 3.Dept. of OMS, the Nippon Dental Univ. S Chool of Life Dentistry at Niigata, Japan, 4.Dept. of OMS, Yokohama City Univ. Gradu Ate School of Medicine, Yokohama, Japan)
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