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The authors would like to thank Dr. K. Clément (University Paris, Service de Médecine et Nutrition, Hôtel-Dieu, Paris) and Professor P. Froguel (CNRS, Institute of Biology, Pasteur Institute, Lille, France), for their contribution to the collection of plasma samples from patients in group 3, and Professor M. Ozata (Department of Endocrinology and Metabolism, Gulhane School of Medicine, Etlik-Ankara, Turkey), for his contribution to the collection of plasma samples from patients in group 2.

Dr. K. Clément was the principal investigator of a project funded by Assistance Publique/Hôpitaux de Paris (PHRC program no. AOM 96088 P921015).