[1] Univ Groningen, Univ Med Ctr Groningen, Dept Med Oncol, NL-9713 GZ Groningen, Netherlands
[2] Hosp Univ Burgos, Dept Med Oncol, Burgos 09006, Spain
[3] Natl Canc Inst, Dept Endocrine Oncol, Bogota, Colombia
[4] Norwegian Univ Sci & Technol, Dept Canc Res & Mol Med, N-7491 Trondheim, Norway
[5] Semmelweis Univ, Dept Med 2, H-1088 Budapest, Hungary
[6] Univ Hosp Marburg, Dept Gastroenterol, D-35043 Marburg, Germany
[7] St Columcilles Hosp, Dept Gen Internal Med, Dublin, Ireland
[8] Univ Milan, Dept Clin Sci & Community Hlth DISCCO, Milan, Italy
[9] Ist Auxol Italiano IRCCS, Lab Endocrine & Metab Res, I-20095 Cusano Milanino, MI, Italy
[10] Univ Hosp, Dept Endocrine Oncol, Uppsala, Sweden
[11] UCL, Inst Canc, London WC1E 6BT, England