[1] Univ Newcastle Upon Tyne, Sch Clin Med Sci, Dept Endocrinol, Newcastle Upon Tyne NE2 4HH, Tyne & Wear, England
[2] Freeman Rd Hosp, Endocrine Unit, Newcastle Upon Tyne NE7 7DN, Tyne & Wear, England
[3] Royal Victoria Infirm, Dept Ophthalmol, Newcastle Upon Tyne NE1 4LP, Tyne & Wear, England
[4] St Marys Hosp, Imperial Coll, Sch Med, Div Med,Sect Endocrinol, London W2 1PG, England