SPIDERS: The spectroscopic follow-up of X-ray-selected clusters of galaxies in SDSS-IV

N. Clerc, A. Merloni, Y. Y. Zhang, A. Finoguenov, T. Dwelly, K. Nandra, C. Collins, K. Dawson, J. P. Kneib, E. Rozo, E. Rykoff, T. Sadibekova, J. Brownstein, Y. T. Lin, J. Ridl, M. Salvato, A. Schwope, M. Steinmetz, H. J. Seo, J. Tinker