Nutrition and Dietetics / Poverty / Diet / China / Food web ecology / Rural China / Schools / Rural Health / Humans / Child / Primary School / Female / Male / Elementary School / Iron / Prevalence / Food Sciences / Body Height / Iron Deficiency Anemia / Hemoglobins / Socioeconomic Factors / Rural China / Schools / Rural Health / Humans / Child / Primary School / Female / Male / Elementary School / Iron / Prevalence / Food Sciences / Body Height / Iron Deficiency Anemia / Hemoglobins / Socioeconomic Factors