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- dove medical press7
- dove medical press ltd7
- orebro univ, clin epidemiol & biostat, orebro, sweden;karolinska inst, dept med, clin epidemiol unit, stockholm, sweden;ucl, dept epidemiol & publ hlth, london, england5
- orebro univ, sch med sci, dept resp med, orebro, sweden5
- orebro univ, sch med sci, orebro, sweden5
- orebro univ, sch med sci, orebro, sweden;cty council varmland, ctr clin res, karlstad, sweden5
- tehran university of medical sciences5
- uppsala universitet, allmanmedicin och preventivmedicin5
- uppsala universitet, lung- allergi- och somnforskning5