Robot‐assisted laparoscopic pyeloplasty for ureteropelvic junction obstruction due to aberrant blood vessel with ipsilateral retrocaval ureter oleh Yuta Inoue, Yasuyuki Naitoh, Jun Ajiki, Ayako Fukui, Takeshi Yamada, Atsuko Fujihara, Kaori Yamada, Fumiya Hongo, Osamu Ukimura