Child Night Blindness and Bitot's Spots Are Public Health Problems in Lay Armachiho District, Central Gondar Zone, Northwest Ethiopia, 2019: A Community-Based Cross-Sectional Study

2019年埃塞俄比亚西北部贡德尔中部地区莱伊阿尔马奇霍县儿童夜盲症和比托氏斑是公共卫生问题：一项基于社区的横断面研究