Transperitoneal laparoscopic umbilical resection of urachal remnants: a feasible surgical method oleh Hideo Yuki, Naoya Ohkubo, Ryo Kurashina, Kazumasa Sakamoto, Issei Suzuki, Kohei Takei, Hironori Betsunoh, Akinori Nukui, Masahiro Yashi, Takao Kamai