Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TONG DC,A review of survival rates for implants placed in grafted maxillary sinuses using meta-analysis,Int J Oral Maxillofac Implants,,,1998,13,,175-182,https://cir.nii.ac.jp/crid/1574231874702348160,