Fig. 1

Operation room settings and the placement of trocar ports. a The patient was placed in supine position. The procedures were performed by two surgeons, with the index operating surgeon and camera man standing on the right side of the patient. b The video laparoscope was introduced via a 5 mm vertical incision at about 3 cm below the umbilicus. Another 5 mm working port was created below the umbilical level at around left mid-clavicular line. The third 5 mm working port was created slightly above the umbilical level at right paramedian area