A medical research safari: fruits and frustrations.
D000350:Africa, Central; D004812:Epidemiologic Methods; D004938:Esophageal Neoplasms / Q000453:epidemiology; D005101:Expeditions; D006801:Humans; D008113:Liver Neoplasms / Q000453:epidemiology; D009369:Neoplasms / Q000453:epidemiology*; D012514:Sarcoma, Kaposi / Q000453:epidemiology; D013274:Stomach Neoplasms / Q000453:epidemiology