Bärebring L., Lamberg-Allardt C., Thorisdottir B., Ramel A., Söderlund F., Arnesen E. K., Nwaru B. I., Dierkes J., and Åkesson A. “Intake of Vitamin B12 in Relation to Vitamin B12 Status in Groups Susceptible to Deficiency: A Systematic Review”. Food & Nutrition Research, vol. 67, June 2023, doi:10.29219/fnr.v67.8626.