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Table 1 The main features of included studies for this meta-analysis

From: Bioinformatics analysis of the expression and role of microRNA-221-3p in head and neck squamous cell carcinoma

Researcher

Year

Country

Cancer/normal

Methods

Sample

TCGA

2019

USA

523/44

qPCR

Tissue

GSE11163

2012

USA

16/5

qPCR

Tissue

GSE103931

2018

Taiwan

30/19

qPCR

Tissue

GSE107591

2018

USA

24/23

qPCR

Tissue

GSE113956

2019

China

25/15

qPCR

Tissue

GSE28100

2015

USA

17/3

qPCR

Tissue

GSE31277

2018

Brazil

15/15

qPCR

Tissue

GSE34496

2017

USA

44/25

qPCR

Tissue

GSE45238

2019

USA

40/40

qPCR

Tissue

GSE51829

2013

China

4/4

qPCR

Tissue

GSE58911

2018

USA

15/15

qPCR

Tissue

GSE69002

2017

USA

3/4

qPCR

Tissue

GSE70289

2018

USA

12/4

qPCR

Tissue

GSE73171

2017

Hong Kong

3/3

qPCR

Tissue

GSE75630

2016

Australia

28/18

qPCR

Tissue

GSE82064

2017

Switzerland

78/18

qPCR

Tissue

GSE98463

2018

Spain

8/8

qPCR

Tissue

Zhou Cheng. et al

2019

China

26/26

qPCR

Tissue