ҩதࢽWeb search.jamas.or.jp 1,798,053 3 CiNii ci.nii.ac.jp 1,086,229 4 National Center for Biotechnology Information www.ncbi.nlm.nih.gov 714,666 5 Google www.google.co.jp 193,943 6 MedicalFinder medicalfinder.jp 184,057 7 Yahoo!ݕࡧ search.yahoo.co.jp 161,859 8 DOI dx.doi.org 145,950 9 Web of Science apps.webofknowledge.com 124,492 10 ຊԽֶձ www.journal.csj.jp 67,171 11 Scopus sc.elsevier.com 50,727 12 ຊޠ൛Wikipedia ja.wikipedia.org 49,456 13 Researchmap researchmap.jp 48,711 14 Nature www.nature.com 47,544 15 Scopus www.scopus.com 39,178 ͲΜͳΣϒαʔϏε͔Β ΞΫηε͞Ε͍ͯΔ ද ΞΫηεͷଟ͍ࢀরݩ FQDN୯Ґɺn= 27,981,518 49