title: Simple impression cytology method for detecting vitamin A deficiency.
mesh_terms: D000368:Aged; D003228:Conjunctiva / Q000166:cytology; D003584:Cytological Techniques; D003906:Developing Countries; D005069:Evaluation Studies as Topic; D006801:Humans; D013194:Staining and Labeling; D014802:Vitamin A Deficiency / Q000175:diagnosis*