Divided method of intercostal nerve block reduces ropivacaine dose by half in thoracoscopic pulmonary resection while maintaining the postoperative pain score and 4-h mobilization: a retrospective study. - Nakai, Aiko; Nakada, Jyunya; Takahashi, Yusuke; Sakakura, Noriaki; Masago, Katuhiro; Okamoto, Sakura; Kuroda, Hiroaki (Journal of Anesthesia, 2023)