Influence of long-term intravenous drug use on physiological indicators and morphological changes of internal organs in pigletsM.I. Barashkin, I.М. Milshtein, М.М. Sibiryakov, А.S. Barkova and E.S. EroshenkoE3S Web Conf., 282 (2021) 04006DOI: https://doi.org/10.1051/e3sconf/202128204006