Beata Lecka-Czernik, PhD, Professor, Department of Orthopedic Surgery, Center for Diabetes and Endocrine Research, University of Toledo Health Sciences Campus, Toledo, OH, USA John L. Fowlkes, MD, James Hamlen Professor of Pediatrics, Vice-Chair for Research, Section Chief, Endocrinology and Diabetes, University of Arkansas for Medical Sciences, Arkansas Children's Hospital, Little Rock, AR, USA