RT Journal Article SR Electronic T1 The Ground - Glass Clotting Time JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 107 OP 113 VO 33 IS 3 A1 Hoffman, George C. A1 Snyder, Ann YR 1966 UL http://www.ccjm.org/content/33/3/107.abstract AB