Massive open star clusters using the VVV survey - V. Young clusters with an OB stellar population S. Ramírez Alegría, J. Borissova, A.-N. Chené, C. Bonatto, R. Kurtev, P. Amigo, M. Kuhn, M. Gromadzki and J. A. Carballo-Bello A&A, 588 (2016) A40 Published online: 15 March 2016 DOI: 10.1051/0004-6361/201526618