[1] St Georges Hosp London, Paediat Surg, Sutton, Surrey, England
[2] Royal Marsden Hosp, Sutton, Surrey, England
[3] Med Univ Vienna, Childrens Canc Res Inst, Dept Paediat, Vienna, Austria
[4] Inst Canc Res, Sutton, Surrey, England
[5] Univ Paris, Necker Enfants Malad Hosp, AP HP, Dept Pediat Surg, Paris, France
[6] Univ Padua, Dept Womens & Childrens Hlth, Pediat Surg, Padua, Italy
[7] Hosp Univ La FE, Paediat Surg Oncol Unit, Paediat Oncol, Valencia, Spain
[8] Leeds Teaching Hosp, Paediat Oncol, Leeds, W Yorkshire, England
[9] Schneider Childrens Med Ctr Israel, Petach, Tikvah, Israel
[10] Tel Aviv Univ, Sackler Sch Med, Tel Aviv, Israel
[11] Univ Childrens Hosp, Dept Pediat Surg, Krakow, Poland
[12] Ghent Univ Hosp, Princess Elisabeth Childrens Hosp, Dept Gastrointestinal & Paediat Surg, Ghent, Belgium
[13] Med Univ Vienna, Paediat Surg, Vienna, Austria
[14] Oslo Univ Hosp, Rikshosp, Oslo, Norway
[15] Karolinska Univ Hosp, Stockholm, Sweden
[16] Univ Hosp Motol, Prague, Czech Republic
[17] Odense Univ Hosp, Dept Surg Gastroenterol A, Odense, Denmark
[18] Univ Hosp Lausanne, Lausanne, Switzerland
[19] Sorbonne Univ, Armand Trousseau Hosp, AP HP, Dept Visceral & Neonatal Pediat Surg, Paris, France
[20] IRCCS Ist Giannina Gaslini, Pediat Surg Unit, Genoa, Italy
[21] Wroclaw Med Univ, Marciniak Hosp, Dept Paediat Surg, Wroclaw, Poland
[22] Wroclaw Med Univ, Dept Paediat Traumatol & Emergency Med, Wroclaw, Poland
[23] Univ Oslo, Oslo, Norway
[24] Ist Nazl Tumori, Fdn IRCCS, Paediat Oncol, Milan, Italy
[25] Jagiellonian Univ, Med Coll, Krakow, Poland
[26] Ghent Univ Hosp, Princess Elisabeth Childrens Hosp, Dept Paediat Haematol & Oncol, Ghent, Belgium
[27] Agia Sofia Childrens Hosp, Athens, Greece
[28] Our Ladys Childrens Hosp, Paediat Haematol Oncol, Dublin, Ireland
[29] Univ Hosp Aarhus, Aarhus, Denmark
[30] Sydney Childrens Hosp, Randwick, NSW, Australia
[31] Portuguese Inst Oncol, Lisbon, Portugal
[32] Univ Coll Hosp, London, England
[33] Great Ormond St Hosp Sick Children, Paediat Oncol, London, England
[34] Inst Gustave Roussy, Paris, France
[35] Med Univ Vienna, St Anna Childrens Hosp, Vienna, Austria