Funding for this research was provided by:
Hebei Provincial Science & Technology Supporting Program (No.15227652D)
CFERN & BEJING TECHNO SOLUSIONS Award Funds on excellent academic achievements.
Article History
Received: 23 May 2018
Accepted: 16 February 2019
First Online: 24 February 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interests. Both at the time of conducting this research as well as at present, none declared by others.
: All research work reported in this study was performed in accordance with all relevant legislation and guidelines.
: This manuscript does not report on or involve the use of any animal or human data or tissue.
: This manuscript does not involve animal or human study. We understand that the text and any pictures published in the article will be freely available on the internet and may be seen by the public.