Hamfelt Arne, Söderhjelm Lars, and Mikaelsson Gunlög. “Plasma Pyridoxal Phosphate in Women Taking Oral Contraceptives since at Least Five Years”. Upsala Journal of Medical Sciences 89, no. 3 (September 1, 1984): 285-286. Accessed May 18, 2024. https://ujms.net/index.php/ujms/article/view/7012.