Meta-analyses/meta-projects: a small but relevant contribution by Sight and Life to the prevention of vitamin A deficiency.
Frigg
M
M
Sight and Life, Basel, Switzerland.
D004032:Diet; D005502:Food; D006266:Health Education; D006801:Humans; D015201:Meta-Analysis as Topic; D014802:Vitamin A Deficiency / Q000517:prevention & control*