Funding for this research was provided by:
Research to Prevent Blindness
Text and Data Mining valid from 2019-12-01
Received: 24 January 2019
Accepted: 17 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: This study was exempt from review by the Institutional Review Board because only de-identified data were used for analysis.
: Not applicable.
: The authors declare that they have no competing interests.