Nitrous oxide versus lidocaine versus no analgesic for in-office hysteroscopy: a randomised clinical trial - Solano Calvo, J.A.; del Valle Rubido, C.; Rodríguez-Miguel, A.; de Abajo, F.J.; Delgado Espeja, J.J.; González Hinojosa, J.; Fernández Muñoz, L.; Zapico Goñi, Á. (BJOG: An International Journal of Obstetrics and Gynaecology, 2021)

Inhalatory analgesia with nitrous oxide vs paracervical infiltration vs control group in hysteroscopic polypectomy: randomised controlled clinical trial - Cristina del Valle Rubido; J.A. Solano Calvo; Antonio Rodríguez Miguel; Juan José Delgado Espeja; Jerónimo González Hinojosa; Álvaro Zapico Goñi (Gynecological Surgery, 2015)