Table 1.

The trend and drainage time of dorsal (ventral) duct

Group	Trend			Drainage time
	Ascend	‘S’ like	Descent	> 12 min	< 12 min
IPD	3 (8)	2 (0)	3 (0)	4 (1)	4 (7)
CPD	3 (5)	2 (0)	1 (1)	4 (0)	2 (6)