Case Ascertainment (include whether this was a single site or multi-site study):

Case Ascertainment (include whether this was a single site or multi-site study):Number of Cases (include information if available about the number who participated and the number who refused; indicate whether any information was provided about those who refused to participate):Control Population (type/number/selection):Type(s)/Method(s) of Data Collection (e.g. questionnaire medical records whether or not there was any procedure for validating some or the data):Type of Data Analysis:Results/Main Findings of Study:Assessment of Bias (selection/information):
Assessment of Confounders:
Comments: