Transforaminal endoscopic lumbar discectomy: learning curve of a single surgeon - Fleiderman, Valenzuela José; Lecaros, Bahamondes Javier; Cirillo, Totera Juan Ignacio; Álvarez Lemos, Facundo; Osorio, Valdivia Pedro; Wolff, Benavides Nicolás (Journal of Spine Surgery, 2023)