Department of Endocrinology, Arabkir Medical Center, Yerevan State Medical University, Yerevan, Armenia. Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany. Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Eythstr. 24, 89075, Ulm, Germany. Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Eythstr. 24, 89075, Ulm, Germany. christian.denzer@uniklinik-ulm.de.