Tetra and pentaquarks from the molecular perspective E. Oset, En Wang, J.J. Xie, L.S. Geng, V.R. Debastiani, J. M. Dias and W. H. Liang EPJ Web Conf., 199 (2019) 01003 Published online: 01 February 2019 DOI: 10.1051/epjconf/201919901003