title: Lack of randomization in occupational epidemiology.
authors.forename: Petter
authors.initials: P
authors.lastname: Kristensen
mesh_terms: D004812:Epidemiologic Methods; D006801:Humans; D006838:Hydrocarbons; D008175:Lung Neoplasms / Q000209:etiology* / Q000401:mortality; D016273:Occupational Exposure; D011897:Random Allocation; D012537:Scandinavian and Nordic Countries / Q000453:epidemiology; D012907:Smoking / Q000009:adverse effects*
chemical_list: D006838:Hydrocarbons; C006647:asphalt