Vitamin A deficiency Public health 2 Community Nutrition 1 Complications 1 Developing Countries 1 Food intake 1 International Cooperation 1 Nepal (mountain, Hill, Terai) 1 Night Blindness 1 Primary school children 1 Vitamin A 1 Vitamin A Deficiency 1 Vitamin A deficiency in children 1 Xerophthalmia 1 drug therapy 1 history 1 therapeutic use 1