Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) NAKAYAMA Yoshimi and MORI Mitsuru,Factors of Elderly People that Have More Than 20 Teeth : Case-control Study in the Eastern Region of Hokkaido Prefecture,JOURNAL OF DENTAL HEALTH,00232831,Japanese Society for Oral Health,2011,61,3,265-272,https://cir.nii.ac.jp/crid/1390282679979608576,https://doi.org/10.5834/jdh.61.3_265