Congenital leptin deficiency due to homozygosity for the Delta133G mutation: report of another case and evaluation of response to four years of leptin therapy - Gibson, W T; Farooqi, I S; Moreau, M; DePaoli, A M; Lawrence, E; O’Rahilly, S; Trussell, R A (J Clin Endocrinol Metab, 2004)