Funding for this research was provided by:
Focus on research and development plan in Shandong province (2018GSF118100, 2017GSF221003)
Jinan clinical medicine science and technology innovation plan (201805069)
Article History
Received: 2 July 2019
Accepted: 9 December 2019
First Online: 17 December 2019
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.