Black, Kathleen
Gochfeld, Michael
Lioy, Paul J
Fan, Zhi-Hua
Yu, Chang Ho
Jeitner, Chris
Hernandez, Marta
Einstein, Stephanie A
Stern, Alan H
Article History
Received: 6 March 2015
Accepted: 24 July 2015
First Online: 2 September 2015
Competing interests
: The authors declare no conflict of interest.