RT Journal Article SR Electronic T1 Sample contamination as a source of error in trace element analysis: an ever-present threat JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 838 OP 838 DO 10.1136/jclinpath-2016-203720 VO 69 IS 9 A1 Wainwright, P A1 Sieniawska, C A1 Cook, P YR 2016 UL http://jcp.bmj.com/content/69/9/838.abstract AB