| #81 | Canadian Journal of Research. -- Ottawa : National Research Council of Canada, 1929-1935. --  ISSN 0366-6581 | 
| #82 | Canadian Medical Association journal. -- Ottawa : Canadian Medical Association, 1911-1985. --  ISSN 0008-4409 | 
| #83 | Causa subita. -- Praha : International Medical Publications, 1998-. --  ISSN 1212-0197 | 
| #84 | Central African journal of medicine. -- Salisbury : Central African Journal of Medicine, 1955-. --  ISSN 0008-9176 | 
| #85 | Cleveland Clinic journal of medicine. -- Cleveland : Cleveland Clinic Educational Foundation, 1987-. --  ISSN 0891-1150 print. --  ISSN 1939-2869 online | 
| #86 | Cleveland Clinic quarterly. -- Cleveland : Cleveland Clinic Educational Foundation, 1932-1986. --  ISSN 0009-8787 | 
| #87 | Clinical and Experimental Medicine. -- Milano : Springer, 2001-. --  ISSN 1591-8890 print. --  ISSN 1591-9528 online | 
| #88 | Clinical and investigative medicine. -- Oxford : Pergamon, 1978-. --  ISSN 0147-958X print. --  ISSN 1488-2353 online | 
| #89 | The Clinical investigator. -- Berlin : Springer, 1992-1994. --  ISSN 0941-0198 | 
| #90 | Clinical medicine. -- London : Royal College of Physicians, 2001-. --  ISSN 1470-2118 print. --  ISSN 1473-4893 online |