Etim, Afiong A., and Maisie H. Etukudo. “Ascorbic Acid Levels in Hepatitis and Non-Hepatitis Subjects in University of Calabar Teaching Hospital (UCTH), Calabar”. Pakistan Journal of Nutrition, vol. 5, no. 5, Aug. 2006, pp. 490-1, https://doi.org/10.3923/pjn.2006.490.491.