RT Journal Article SR Electronic T1 Correction: Relationship between gay app use and HIV testing among men who have sex with men in Shenzhen, China: a serial cross-sectional study JF BMJ Open JO BMJ Open FD British Medical Journal Publishing Group SP e028933corr1 DO 10.1136/bmjopen-2019-028933corr1 VO 9 IS 9 YR 2019 UL http://bmjopen.bmj.com/content/9/9/e028933corr1.abstract AB