title: Letter to the editor.
authors.affiliation: a Division of Pulmonary and Critical Care Medicine, Stanford Medicine, Stanford , California.
authors.forename: David
authors.initials: D
authors.lastname: Weill
authors.forename: Eric
authors.initials: E
authors.lastname: Chatfield
authors.forename: Anthony
authors.initials: A
authors.lastname: Cox
authors.forename: John
authors.initials: J
authors.lastname: Gamble
authors.forename: Graham
authors.initials: G
authors.lastname: Gibbs
authors.forename: Ann
authors.initials: A
authors.lastname: Wylie
mesh_terms: D000395:Air Pollutants, Occupational / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D006801:Humans; D019570:Inhalation Exposure / Q000032:analysis*; D007501:Iron; D008906:Mining; D016273:Occupational Exposure / Q000032:analysis*; D052638:Particulate Matter / Q000032:analysis*; D017640:Silicates
chemical_list: D000395:Air Pollutants, Occupational; D052638:Particulate Matter; D017640:Silicates; D007501:Iron