On the nature of near-threshold bound and virtual states Inka Matuschek, Vadim Baru, Feng-Kun Guo and Christoph Hanhart Eur. Phys. J. A, 57 3 (2021) 101 Published online: 22 March 2021 DOI: 10.1140/epja/s10050-021-00413-y