title: Inconsistency in the length of a working month.
authors.forename: P K
authors.initials: PK
authors.lastname: Hopke
authors.forename: N
authors.initials: N
authors.lastname: Montassier
mesh_terms: D006801:Humans; D016273:Occupational Exposure / Q000032:analysis*; D011886:Radon / Q000032:analysis*; D013997:Time Factors
chemical_list: D011886:Radon