Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA

Correspondence to Erin E. Kershaw, MD, Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, 200 Lothrop Street, BST W1055, Pittsburgh, PA 15261, USA. Tel: +1 412 648 9770; fax: +1 412 648 3290; e-mail: [email protected]