RT Journal Article SR Electronic T1 Oral Microbiology JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 238 OP 239 DO 10.1136/jcp.38.2.238 VO 38 IS 2 A1 T Wallace Macfarlane YR 1985 UL http://jcp.bmj.com/content/38/2/238.abstract AB