It's the context!
From the Department of Pediatrics, St. Louis Children's Hospital, St. Louis, MO.
Mark
M
Manary
D001823:Body Composition; D019587:Dietary Supplements; D005260:Female; D005527:Food, Fortified; D006801:Humans; D007225:Infant Food / Q000032:analysis*; D019266:Iron, Dietary / Q000097:blood*; D008297:Male; D018977:Micronutrients / Q000008:administration & dosage*; D010298:Parity / Q000187:drug effects*; D011247:Pregnancy
D019266:Iron, Dietary; D018977:Micronutrients