Response to: Risk Factors for Cement Loosening after Vertebroplasty for Osteoporotic Vertebral Fracture with Intravertebral Cleft: A Retrospective Analysis - Toshio Nakamae; Kiyotaka Yamada; Yasuyuki Tsuchida; Orso Lorenzo Osti; Nobuo Adachi; Yoshinori Fujimoto (Asian Spine Journal, 2019)