1. Novo Nordisk A/S, 2760 Måløv, Denmark.
2. Novo Nordisk A/S, 2860 Søborg, Denmark.
3. Department of Endocrine Neurobiology, Institute of Experimental Medicine, Hungarian Academy of Sciences, 1083 Budapest, Hungary.
4. Department of Medicine, Division of Endocrinology, Diabetes and Metabolism, Tupper Research Institute, Tufts Medical Center, Boston, MA 02111, USA.