title: Letter: "Working groups" in cancer etiology.
mesh_terms: D001943:Breast Neoplasms / Q000209:etiology; D005260:Female; D005770:Gastrointestinal Neoplasms / Q000209:etiology; D006801:Humans; D008297:Male; D009062:Mouth Neoplasms / Q000209:etiology; D009369:Neoplasms / Q000209:etiology* / Q000517:prevention & control; D010051:Ovarian Neoplasms / Q000209:etiology; D011471:Prostatic Neoplasms / Q000209:etiology; D012106:Research; D012142:Respiratory Tract Neoplasms / Q000209:etiology; D012907:Smoking; D014565:Urogenital Neoplasms / Q000209:etiology; D014594:Uterine Neoplasms / Q000209:etiology