Table:
Study	Region	Diagnostic criteria	Prevalence (per million population)	Prevalence > 50 yrs (per million population)
Lingberg et al.[2]	Sweden	Biopsy and clinical data	2.2	n/a
Kaipiainen-Seppanen and Aho[4]	Finland	Not mentioned	0.9	n/a
Philips et al.[5]	Australia	Griggs et al. criteria	9.3	35.3
Badrising et al.[3]	Netherlands	ENMC criteria	4.9	16
Felice and North (Connecticut, USA)[6]	Connecticut, USA	Griggs et al. criteria	10.7	28.9 (>45 yrs)
Needham et al.[1]	Western Australia	Clinical and biopsy criteria	14.9	51.2
Wilson et al.[7]	Olmsted County, USA	Griggs et al. criteria	71	n/a
Oflazer et al.[8]	Istanbul, Turkey	Own criteria from the study (biopsy and clinical data)	1.0	6.0
Suzuki et al.[9]	Japan	Clinical and biopsy criteria	1.3 (in 1991)	n/a
9.8 (in 2003)	n/a
Tan et al.[10]	South Australia	Biopsy and clinical data	50.5	139.3

Convert the table into Markdown language.

| Study | Region | Diagnostic criteria | Prevalence (per million population) | Prevalence > 50 yrs (per million population) | 
 | --- | --- | --- | --- | --- | 
 | Lingberg et al.[2] | Sweden | Biopsy and clinical data | 2.2 | n/a | 
 | Kaipiainen-Seppanen and Aho[4] | Finland | Not mentioned | 0.9 | n/a | 
 | Philips et al.[5] | Australia | Griggs et al. criteria | 9.3 | 35.3 | 
 | Badrising et al.[3] | Netherlands | ENMC criteria | 4.9 | 16 | 
 | Felice and North (Connecticut, USA)[6] | Connecticut, USA | Griggs et al. criteria | 10.7 | 28.9 (>45 yrs) | 
 | Needham et al.[1] | Western Australia | Clinical and biopsy criteria | 14.9 | 51.2 | 
 | Wilson et al.[7] | Olmsted County, USA | Griggs et al. criteria | 71 | n/a | 
 | Oflazer et al.[8] | Istanbul, Turkey | Own criteria from the study (biopsy and clinical data) | 1.0 | 6.0 | 
 | <ROWSPAN=2> Suzuki et al.[9] | <ROWSPAN=2> Japan | <ROWSPAN=2> Clinical and biopsy criteria | 1.3 (in 1991) | n/a | 
 | 9.8 (in 2003) | n/a | 
 | Tan et al.[10] | South Australia | Biopsy and clinical data | 50.5 | 139.3 |