RT Journal Article SR Electronic T1 Searching the Biomedical Literature: Research Study Designs and Critical Appraisal JF American Society for Clinical Laboratory Science JO Clin Lab Sci FD American Society of Chemistry and Laboratory Science SP 42 OP 48 DO 10.29074/ascls.21.1.42 VO 21 IS 1 A1 Callas, Peter W YR 2008 UL http://hwmaint.clsjournal.ascls.org/content/21/1/42.abstract AB