2nd Department of Pediatrics of the National and Kapodistrian University of Athens, "P. & A. Kyriakou" Children's Hospital, Athens, Greece; Institute of Molecular Biology and Biotechnology of the Foundation for Research and Technology Hellas; National Institute of Health, Eunice Kennedy Shriver National Insttute of Child Health and Human Development (NICHD)
Division of Endocrinology, Diabetes and Metabolism, 2nd Department of Pediatrics of the National and Kapodistrian University of Athens, "P. & A. Kyriakou" Children's Hospital, Athens, Greece.