supported by the National Natural Science Foundation of China(51136002,51076079);the 12th Five-year National Key Technology R&D Program(2012BAJ02B03);the National High Technology Researchand Development Program of China(2010AA064903);Tsinghua University Initiative Scientific Research Program(20121088010);China Postdoctoral Science Foundation funded project(2012M510459)
This study evaluated the prevalence and risk factors for asthma,allergy and related symptoms;and breastfeeding patterns and durations for 5479 Beijing children aged 3–6.Parents of children in randomly selected kinder...