- Correspondence to Professor Zhijie An, Department of Oncology, Qingdao Municipal Hospital, Qingdao 266000, China; and Professor Chengye Guo, Department of Oncology, Qingdao Municipal Hospital, Qingdao 266012, China;
- Received October 25, 2017
- Revised February 9, 2018
- Accepted February 12, 2018
- First published March 20, 2018.
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