VNET [21Vianet] 6-K: 21Vianet Group, Inc. Reports Unaudited Fourth Quarter and
[21Vianet Group, Inc. Reports Unaudited Fourth Quarter and Full Year 2017 Financial Results Adjusted EBITDA up 228.9% YoY to RMB171.0 million Adjusted EBITDA margin expanded to 22.3% from 5.8% in prior year period Dial-in BEIJING, March 13, 2018 (GLOBE NEWSWIRE) 21Vianet Group, Inc. (Nasdaq: VNET) ]