[1] Univ Hosp Copenhagen, Rigshospitalet, Dept Clin Genet, Copenhagen, Denmark
[2] Omicron Aps, Copenhagen, Denmark
[3] Odense Univ Hosp, Dept Clin Genet, Odense, Denmark
[4] Univ Southern Denmark, Inst Clin Res, Human Genet, Odense, Denmark
[5] Copenhagen Univ Hosp Amager & Hvidovre, Med Div, Gastrounit, Hvidovre, Denmark
[6] Copenhagen Univ Hosp, Dept Pathol, Herlev, Denmark
[7] Univ Copenhagen, Dept Clin Med, Copenhagen, Denmark
[8] Copenhagen Univ Hosp Amager & Hvidovre, Danish Polyposis Registry, Gastrounit, Hvidovre, Denmark
[9] Univ Hosp Copenhagen, Dept Clin Genet, Rigshospitalet, Blegdamsvej 9, DK-2100 Copenhagen, Denmark