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 jclinpath-2017-204449 DO 10.1136/jclinpath-2017-204449 A1 Lysanne D C Graafmans A1 Folkert H M Morsink A1 G Johan A Offerhaus A1 Francis M Giardiello A1 Lodewijk A A Brosens YR 2017 UL http://jcp.bmj.com/content/early/2017/04/19/jclinpath-2017-204449.abstract AB