{{Cite journal| doi = 10.1371/journal.pone.0104978| issn = 1932-6203 (Electronic) 1932-6203 (Linking)| volume = 9| issue = 8| pages = –104978| last1 = Adam| first1 = M.| last2 = Imboden| first2 = M.| last3 = Boes| first3 = E.| last4 = Schaffner| first4 = E.| last5 = Kunzli| first5 = N.| last6 = Phuleria| first6 = H. C.| last7 = Kronenberg| first7 = F.| last8 = Gaspoz| first8 = J. M.| last9 = Carballo| first9 = D.| last10 = Probst-Hensch| first10 = N.| title = Modifying effect of a common polymorphism in the interleukin-6 promoter on the relationship between long-term exposure to traffic-related particulate matter and heart rate variability| journal = PLoS One| date = 2014-08-19| pmid = 25133672}}