For citations:

Levchik N.K., Surganova V.I., Zilberberg N.V., Ponomareva M.V. Difficulties and errors in the diagnosis of primary syphilis in proctological practice (analysis of clinical cases). Lechaschi Vrach. 2019;(11):16-19. (In Russ.) https://doi.org/10.26295/OS.2019.36.68.004