title: Lumping, splitting, and sorting.
authors.forename: Frank C
authors.initials: FC
authors.lastname: Detterbeck
mesh_terms: D018288:Carcinoma, Small Cell / Q000473:pathology*; D006801:Humans; D008175:Lung Neoplasms / Q000473:pathology*; D009367:Neoplasm Staging / Q000379:methods; D015203:Reproducibility of Results; D012720:Severity of Illness Index