1. Diabetes Division, St. Josef-Hospital; Ruhr-University Bochum; Bochum Germany
2. Department of Pathology; Ruhr-University Bochum; Bochum Germany
3. Department of Surgery, St. Josef-Hospital; Ruhr-University Bochum; Bochum Germany
4. Bellvitge Hospital, Department of Endocrinology; Feixa Llarga s/n, Hospitalet de Llobregat, 08907; Barcelona Spain