Vitamin B12 Sufficiency and Cognitive Test Scores of Children With and Without Perinatally Acquired HIV Infection or Exposure – A Prospective Cohort Study - Amara Ezeamama; Amara Ezeamama; Sarah K Zalwango; Lois Bayigga; Jorem E Awadu; Noeline Nakasujja; Alla E Sikorskii; Bruno O Giordani (Current Developments in Nutrition)