Topical Issue on Opportunities for Lattice Gauge Theory in the Era of Exascale Computing William Detmold, Andreas Kronfeld and Ulf-G. Meißner Eur. Phys. J. A, 55 11 (2019) 192 Published online: 14 November 2019 DOI: 10.1140/epja/i2019-12942-8