Zhang, Chunxia
Dang, Guangfu
Zhao, Tianmei
Wang, DongLin
Su, Yan
Qu, Yi
Article History
Received: 16 August 2017
Accepted: 7 April 2018
First Online: 12 April 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study has been approved by the local institutional ethics committee of Jinan Mingshui Eye Hospital and has been performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.