4.Fishman SM, Christian P, West KP. The role of vitamins in the prevention and control of anaemia. Public Health Nutr. 2000 Jun;3(2):125-50. http://www.ncbi.nlm.nih.gov/pubmed/10948381
5.Berson, EL., Rosner, B., Sandberg, MA., Hayes, KC., Nicholson, BW., Weigel-DiFranco, C., Willett, W., A randomized trial of vitamin A and vitamin E supplementation for retinitis pigmentosa. Arch Ophthalmol. 1993 Jun;111(6):761-72. http://www.ncbi.nlm.nih.gov/pubmed/8512476
6.Hovdenak N, Haram K. Influence of mineral and vitamin supplements on pregnancy outcome. Eur J Obstet Gynecol Reprod Biol. 2012 Oct;164(2):127-32. http://www.ncbi.nlm.nih.gov/pubmed/22771225