DOI:
10.1055/s-00000031
Klinische Monatsblätter für Augenheilkunde
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References
Sommer A.
Vitamin A deficiency and its consequences: a field guide to detection and control.
3rd ed..
Geneva: World Health Organization; 1995. Accessed January 29, 2021 at:
https://apps.who.int/iris/handle/10665/40535
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