The link address is: http://jech.bmjjournals.com/cgi/content/full/57/7/480?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=Basic+molecular+genetics+for+epidemiologists&andorexactfulltext=and&searchid=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT