A critical appraisal and evaluation of modern PDFs A. Accardi, S. Alekhin, J. Blümlein, M. V. Garzelli, K. Lipka, W. Melnitchouk, S. Moch, J. F. Owens, R. Plačakytė, E. Reya et al. (3 more) Eur. Phys. J. C, 76 8 (2016) 471 Published online: 23 August 2016 DOI: 10.1140/epjc/s10052-016-4285-4