Fang, Jie
Liu, Chenglian
Simos, T. E.
Article History
Received: 5 August 2017
Accepted: 11 August 2017
First Online: 1 September 2017
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Consent to submit has been received explicitly from all co-authors, as well as from the responsible authorities—tacitly or explicitly—at the institute/organization where the work has been carried out, before the work is submitted.