RT Journal Article SR Electronic T1 The Design and Analysis of Long-Term Animal Experiments JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 1493 OP 1493 DO 10.1136/jcp.40.12.1493-a VO 40 IS 12 A1 Dayan, AD YR 1987 UL http://jcp.bmj.com/content/40/12/1493.1.abstract AB