A 50-50% mixture of nitrous oxide-oxygen in transrectal ultrasound-guided prostate biopsy: A randomized and prospective clinical trial. - Cazarim, Gabriel da Silva; Verçosa, Nubia; Carneiro, Leonel; Pastor, Rachel; da Silva, Elizabeth Fernandes Vaz; Barrucand, Louis; Cavalcanti, Ismar Lima (PLoS ONE, 2018)