1S-2S energy shift in muonic hydrogen R. N. Faustov, A. A. Krutov, A. P. Martynenko, F. A. Martynenko and O. S. Sukhorukova EPJ Web Conf., 204 (2019) 05005 Published online: 03 April 2019 DOI: 10.1051/epjconf/201920405005