Weill Cornell Medical College in Qatar, Research Division, Qatar Foundation, Education City, PO. Box 24144, Doha, Qatar; Institute of Human Development, Centre for Endocrinology & Diabetes, Faculty of Medical and Human Sciences, University of Manchester and NIHR/Wellcome Trust Clinical Research Facility, Manchester M13 9NT, UK. Phi Med Europe Barcelona, Department of Electronics Engineering, Barcelona, Spain. Institute of Human Development, Centre for Endocrinology & Diabetes, Faculty of Medical and Human Sciences, University of Manchester and NIHR/Wellcome Trust Clinical Research Facility, Manchester M13 9NT, UK. ICEN, Catalonian Institute of Endocrinology and Nutrition, Medical Centre, Barcelona, Spain; Endocrinology Department, Hospital Clinic Universitario de Barcelona, Spain. Weill Cornell Medical College in Qatar, Research Division, Qatar Foundation, Education City, PO. Box 24144, Doha, Qatar; Institute of Human Development, Centre for Endocrinology & Diabetes, Faculty of Medical and Human Sciences, University of Manchester and NIHR/Wellcome Trust Clinical Research Facility, Manchester M13 9NT, UK. Electronic address: ram2045@qatar-med.cornell.edu.