Erratum to: Hadronic shift in pionic hydrogen M. Hennebach, D. F. Anagnostopoulos, A. Dax, H. Fuhrmann, D. Gotta, A. Gruber, A. Hirtl, P. Indelicato, Y. -W. Liu, B. Manil et al. (5 more) Eur. Phys. J. A, 55 2 (2019) 24 Published online: 21 February 2019 DOI: 10.1140/epja/i2019-12710-x