A pictorial representation of confounding in epidemiologic studies.
D000367:Age Factors; D000368:Aged; D000428:Alcohol Drinking; D004812:Epidemiologic Methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D009062:Mouth Neoplasms / Q000209:etiology; D010610:Pharyngeal Neoplasms / Q000209:etiology; D012306:Risk; D012737:Sex Factors; D012907:Smoking / Q000150:complications; D014277:Trigeminal Neuralgia / Q000401:mortality