Study	Reason for exclusion
Alishahi 2005	Comment on an included trial (Larsen 2004).
Giraudo 2001	Randomised comparison between two pressures of pneumoperitoneum. Abdominal wall lift was performed in patients with contraindications to pneumoperitoneum.
Jolobe 1997	Comment on an included trial (Koivusalo 1996b).
Jugool 2004	Comment on an included trial (Larsen 2004).
Kim 2002	Although the authors say they have randomised the patients, they state that they tried to match up the patients. Attempts were made to contact the author. There was no reply.
Kurauchi 1999	Surgeon's preference was used to determine the allocation.