Is dark-field microscopy still useful for the primary syphilis diagnosis in the 21ST century?

1. Lejarraga-Cañas, C.
2. Ayerdi-Aguirrebengoa, O.
3. Menéndez-Prieto, B.
4. Tello-Romero, E.
5. Rodríguez-Martín, C.
6. del Romero-Guerrero, J.