Different, not biased.
Hopper
J L
JL
D015982:Bias; D016022:Case-Control Studies; D003625:Data Collection; D003627:Data Interpretation, Statistical; D030342:Genetic Diseases, Inborn / Q000453:epidemiology* / Q000209:etiology; D006801:Humans; D008487:Medical History Taking / Q000706:statistics & numerical data; D016017:Odds Ratio; D012307:Risk Factors