Serological diagnosis of secondary syphilis in a Rituximab‐treated patient: an emerging diagnostic challenge?. (5th February 2021) - Lefeuvre, C.; Croué, A.; Abgueguen, P.; Letzelter, M.; Ducancelle, A.; Grange, P.; Benhaddou, N.; Dupin, N.; Le Guillou‐Guillemette, H.; Le Clec'h, C.