Original sentence: 5 Dr.He completed his doctorate thesis at the University of Athens, followed by a residency in pediatrics at New York University Medical School, New York, NY, and a fellowship in Endocrinology, Metabolism and Diabetes at the Clinical Center of the National Institutes of Health, Bethesda, Maryland.He has held the positions at NIH of   directorship of the ACGME-accredited Combined NIH/Georgetown University Pediatric Endocrinology Training Program,     chief of the National Institute of Child Health and Human Development, NIH, Developmental Endocrinology Branch, Pediatric Endocrinology Section, and finally Chief of the National Institute of Child Health and Human Development,  Pediatric and Reproductive Endocrinology Branch
Edited sentence: He completed his doctorate thesis at the University of Athens, followed by a residency in Pediatrics at New York University Medical School, New York, NY, and a fellowship in Endocrinology, Metabolism and Diabetes at the Clinical Center of the National Institutes of Health, Bethesda, Maryland.He has held the positions at NIH of   directorship of the ACGME-accredited Affiliate NIH/Georgetown University Pediatric Endocrinology Training Program,     chief of the National Institute of Child Health and Human Development, NIH, Developmental Endocrinology Branch, Pediatric Endocrinology Section, and finally Chief of the National Institute of Child Health and Human Development,  Pediatric and Reproductive Endocrinology Branch