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Tasur Kumar Seen, Muntazir Sayed, Muhammad Bilal, Jonathan Vincent Reyes, Priyanka Bhandari, Vennis Lourdusamy, Ahmed Al-khazraji, Umer Syed, Yasar Sattar, Raghav Bansal 
World J Gastroenterol 27(23):3238-3248. Published online Jun 21, 2021. doi: 10.3748/wjg.v27.i23.3238
Patricia Holanda Almeida, Celso E L Matielo, Lilian A Curvelo, Rodrigo A Rocco, Guilherme Felga, Bianca Della Guardia, Yuri L Boteon 
World J Gastroenterol 27(23):3249-3261. Published online Jun 21, 2021. doi: 10.3748/wjg.v27.i23.3249
Alina Buliarca, Adelina Horhat, Tudor Mocan, Rares Craciun, Bogdan Procopet, Zeno Sparchez 
World J Gastroenterol 27(23):3290-3302. Published online Jun 21, 2021. doi: 10.3748/wjg.v27.i23.3290
Carmelina Calitri, Ilaria Fumi, Maria Giovanna Ignaccolo, Elena Banino, Stefania Benetti, Maria Maddalena Lupica, Francesca Fantone, Mariella Pace, Franco Garofalo 
World J Gastroenterol 27(23):3303-3316. Published online Jun 21, 2021. doi: 10.3748/wjg.v27.i23.3303
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Case Control Study
Retrospective Cohort Study
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Prospective Study
Ligia Yukie Sassaki, Sender J Miszputen, Roberto Luiz Kaiser Junior, Wilson R Catapani, Mauro Bafutto, António S Scotton, Cyrla Zaltman, Julio Pinheiro Baima, Hagata S Ramos, Mikaell Alexandre Gouvea Faria, Carolina D Gonçalves, Isabella Miranda Guimaraes, Cristina Flores, Heda M B S Amarante, Rodrigo Bremer Nones, José Miguel Luz Parente, Murilo Moura Lima, Júlio Maria Chebli, Maria de Lourdes Abreu Ferrari, Julia F Campos, Maria G P Sanna, Odery Ramos, Rogério Serafim Parra, Jose J R da Rocha, Omar Feres, Marley R Feitosa, Rosana Fusaro Caratin, Juliana Tosta Senra, Genoile Oliveira Santana 
World J Gastroenterol 27(23):3396-3412. Published online Jun 21, 2021. doi: 10.3748/wjg.v27.i23.3396
Systematic Reviews