Occupational exposure to gases/fumes and mineral dust affect DNA methylation levels of genes regulating expression by van der Plaat, DA, Vonk, JM, Terzikhan, N, de Jong, K, de Vries, M, La Bastide-van Gemert, S, van Diemen, CC, Lahousse, L, Brusselle, GG, Nedeljkovic, I, Amin, N, BIOS Consortium, Kromhout, H, Vermeulen, RCH, Postma, DS, van Duijn, CM, Boezen, HM