Ingenbleek, Y., Vandenhove, MF., & Deruelle, M. (1981). Differences in the Retinol Circulating Complex Between Healthy Male and Female Infants. Clinica Chimica Acta, 114(2-3), 219-224. https://doi.org/10.1016/0009-8981(81)90394-6 (Original work published 1981)