Button, R W
Lin, F
Ercolano, E
Vincent, J H
Hu, B
Hanemann, C O
Luo, S
Article History
Received: 12 June 2014
Revised: 4 September 2014
Accepted: 8 September 2014
First Online: 16 October 2014
Competing interests
: The authors declare no conflict of interest.