Table 2. Comparisons of Complications between the Two Groups.

Complications	Clavien grade 1		Clavien grade 2		Clavien grade 3
	pre-2008	post-2008	pre-2008	post-2008	pre-2008	post-2008
Overall complications	22(17.1%)	17(9.9%)	9(7.0%)	10(5.8%)	11(8.5%)	6(3.5%)
Biliary complications	7(5.4%)	6(3.5%)	4(3.1%)	4(2.3%)	4(3.1%)	2(1.2%)
Biliary leak	7	6	4	4	2	1
Biliary stricture	0	0	0	0	2	1
Infection	6(4.7%)	7(4.1%)	2(1.6%)	2(1.2%)	3(2.3%)	2(1.2%)
Wound infection	2	5	1	2	1	1
Intraabdominal infection	4	2	0	0	2	1
Lung	0	0	1	0	0	0
Postoperative bleeding	0	0	2(1.6%)	3(1.8%)	1(0.8%)	2(1.2%)
Intraabdominal bleeding	0	0	1	2	1	2
Incision bleeding	0	0	1	1	0	0
Effusion	6 (4.7%)	4 (2.3%)	1 (0.8%)	1 (0.6%)	1 (0.8%)	0
Pleural effusion	2	2	1	1	1	0
Intraabdominal effusion	4	2	0	0	0	0
Vascular complications
Portal vein thrombosis	0	0	0	0	1	0
Others	3	0	0	0	1	0

Others: voice change, lymph leakage, hepatic encephalopathy.