Continent & Country   

Sample            

Method         

Number (%)

South America

Tumour

RQ-PCR

15/22 (68)

Chile

North America

Tumour

RQ-PCR

2/113 (1.8)

USA [15 ]                       

Europe

Tumour

nPCR

48/65 (73.8)

Hungary [16]

Asia

Cells for cytobrush                      

PCR

26/89 (32.5)

Thailand [17]

India [18]

Tissue

PCR

18/62 (29)

Yemen [19]

Biopsy

PCR

44/60 (73.3)