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2. Etiologic factors in rickets of very low-birth-weight infants;Callenbach, J.C.; Sheehan, M.B.; Abramson, S.J.; Hall, R.T.;J Pediatr,1981
3. Plasma active vitamin D concentration in low birthweight infants with rickets and its response to vitamin D treatment;Seino, Y.; Ishii, T.; Shimotsuji, T.; Ishida, M.; Yabuuchi, H.;Arch Dis Child,1981
4. Plasma 25hydroxyvitamin D and rickets in infants of extremely low birth weight;McIntosh, N.; Livesey, A.; Brooke, O.G.;Arch Dis Child,1982
5. Effects of 1.25dihydroxycholecalciferol on calcium, phosphorus, and magnesium balance, and on circulating parathyroid hormone and calcitonin in preterm infants;Senterre, J.; David, L.; Salle, B.,1980