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Open-Access Journal
Editorial
Elinthon Tavares Veronese, Pablo Maria Alberto Pomerantzeff, Fábio Biscegli Jatene 
World J Cardiol 13(12):650-653. Published online Dec 26, 2021. doi: 10.4330/wjc.v13.i12.650
Review
Roberto M Saraiva, Mauro Felippe F Mediano, Fernanda SNS Mendes, Gilberto Marcelo Sperandio da Silva, Henrique H Veloso, Luiz Henrique C Sangenis, Paula Simplício da Silva, Flavia Mazzoli-Rocha, Andréa S Sousa, Marcelo T Holanda, Alejandro M Hasslocher-Moreno 
World J Cardiol 13(12):654-675. Published online Dec 26, 2021. doi: 10.4330/wjc.v13.i12.654
Eduardo M Vilela, Ricardo Ladeiras-Lopes, Ana Joao, Joana Braga, Susana Torres, Sofia Viamonte, José Ribeiro, Madalena Teixeira, José P Nunes, Ricardo Fontes-Carvalho 
World J Cardiol 13(12):695-709. Published online Dec 26, 2021. doi: 10.4330/wjc.v13.i12.695
Minireviews
Shiva P Ponamgi, Muhammad Haisum Maqsood, Pranathi R Sundaragiri, Michael G DelCore, Arun Kanmanthareddy, Wissam A Jaber, William J Nicholson, Saraschandra Vallabhajosyula 
World J Cardiol 13(12):720-732. Published online Dec 26, 2021. doi: 10.4330/wjc.v13.i12.720
Retrospective Study
Abhishek Khemka, David A Sutter, Mazin N Habhab, Athanasios Thomaides, Kyle Hornsby, Harvey Feigenbaum, Stephen G Sawada 
World J Cardiol 13(12):733-744. Published online Dec 26, 2021. doi: 10.4330/wjc.v13.i12.733
Observational Study