Hao, Z
Münzberg, H
Rezai-Zadeh, K
Keenan, M
Coulon, D
Lu, H
Berthoud, H-R
Ye, J
Article History
Received: 25 August 2014
Revised: 8 October 2014
Accepted: 18 October 2014
First Online: 28 October 2014
Competing interests
: The authors declare no conflict of interest.