title: Cases and controls from different settings: ideals and practicalities.
authors.forename: R H
authors.initials: RH
authors.lastname: Fletcher
mesh_terms: D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D003625:Data Collection; D004198:Disease Susceptibility / Q000453:epidemiology; D005240:Feasibility Studies; D005819:Genetic Markers / Q000235:genetics; D020022:Genetic Predisposition to Disease; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data; D006801:Humans; D015994:Incidence; D008175:Lung Neoplasms / Q000453:epidemiology* / Q000235:genetics; D017720:Molecular Epidemiology; D018579:Patient Selection; D012017:Referral and Consultation / Q000706:statistics & numerical data; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects / Q000453:epidemiology*; D013781:Texas / Q000453:epidemiology; D014505:Urban Population / Q000706:statistics & numerical data
chemical_list: D005819:Genetic Markers