RSSDI Repository, Complications of Diabetes Demonstration
RSSDI Repository, Complications of Diabetes Demonstration

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… self-selection bias in a nested case control study on indoor environmental factors and their association to asthma and allergic symptoms among pre-school children

… in a cross-sectional questionnaire to the parents of 14,077 children aged 1–6 years in a first step. In a second step 2,156 of the children were invited to co-operate in a case-control study…..... Read More