Liu, X
Barrett, D M
Jiang, S
Fang, C
Kalos, M
Grupp, S A
June, C H
Zhao, Y
Article History
Received: 23 April 2016
Accepted: 28 April 2016
First Online: 3 June 2016
Competing interests
: XL, MK, CHJ and YZ have financial interests due to intellectual property and patents in the field of cell and gene therapy. The conflicts of interest are managed in accordance with University of Pennsylvania policy and oversight. The remaining authors declare no conflict of interests.