@base . a , , ; , , ; "Canadian Medical Association journal." ; ; ; "0008-4409" ; ; "0008-4409" ; ; "0008-4409" ; "Canadian Medical Association journal." , "Canadian Medical Association journal" ; . a ; . a ; "0008-4409" ; . . a ; "0008-4409" ; . "Canada" . a ; ; "20040609162900.0"^^ ; ; . a , ; "Canadian Medical Association journal" . a .