1. Department of Physiology, School of Medical Sciences, University of Bristol, Bristol BS8 1TD
2. School of Biomedical Sciences, University of Leeds, Worsley Medical and Dental Building, Leeds LS2 9NQ
3. Molecular Neuroendocrinology Research Group, University Research Centre for Neuroendocrinology, University of Bristol, Bristol Royal Infirmary, Marlborough Street, Bristol BS2 8HW, UK