[1] Imperial Coll London, London, England
[2] St Marks Hosp, London, England
[3] Univ Hosp Essen, Essen, Germany
[4] Westkuesten Klinikum Heide, Heide, Germany
[5] Imperial Coll London, Dept Surg & Canc, London, England
[6] Med Univ Silesia, Dept Pathophysiol & Endocrinol, Katowice, Poland