Chronic pancreatitis: A surgical disease? Role of the Frey procedure

Table 1 Main studies comparing surgical procedures for chronic pancreatitis

Ref.	Year	Study design	Comparison	Median follow-up(in months)
Izbicki et al[63]	1998	Retrospective	Frey vs PPPD	24
Aspelund et al[66]	2005	Retrospective	Frey vs PD	36
Hildebrand et al[53]	2010	Retrospective	Frey vs PD	50
Farkas et al[64]	2006	Prospective	Frey vs PPPD	24
Chiang et al[62]	2007	Prospective	Frey vs PD	6
Strate et al[65]	2008	Prospective	Frey vs PPPD	84
Bachmann et al[67]	2013	Prospective	Frey vs PD	180
Izbicki et al[46]	1995	Prospective	Frey vs Beger	18
Strate et al[68]	2005	Prospective	Frey vs Beger	104
Keck et al[47]	2010	Retrospective	Frey vs Beger	20.6

PPPD: Pylorus-preserving pancreaticoduodenectomy; PD: Pancreaticoduodenectomy.