1. Regional Centre for Endocrinology and Diabetes (I.R.W., N.S., C.H.C., P.M.B., S.J.H., D.R.M., A.B.A.), Royal Victoria Hospital, Belfast BT12 6BA, United Kingdom
2. Regional Endocrine Laboratory (H.L., B.S.), Royal Victoria Hospital, Belfast BT12 6BA, United Kingdom