A Case in Which Flexible Hysterofiberscopic Observation Was Useful for Removal of the Arm of a Levonorgestrel-releasing Intrauterine System That Had Pierced the Cervical Wall - Tatsuji Hoshino; Mizuho Tani; Tatsuo Mori; Masato Kinugasa; Yoshiyuki Tsuji (Wolters Kluwer Medknow Publications, 2024)