RT Journal Article SR Electronic T1 Absence of SMAD9v90m mutation in juvenile polyposis syndrome JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 640 OP 640 DO 10.1136/jclinpath-2017-204449 VO 70 IS 7 A1 Graafmans, Lysanne D C A1 Morsink, Folkert H M A1 Offerhaus, G Johan A A1 Giardiello, Francis M A1 Brosens, Lodewijk A A YR 2017 UL http://jcp.bmj.com/content/70/7/640.abstract AB