Ruan, Guiying, Department of Paediatrics, Taizhou Municipal Hospital, the Affiliated Hospital of Medical College of Taizhou University, Taizhou, Zhejiang, 318000, China
Rubio-López, Nuria, Public and Environmental Health Unit, Department of Preventive Medicine, University of Valencia, CIBER Epidemiology and Public Health (CIBERESP), and Center for Public Health Research (CSISP), Valencia, Spain
Ruiz-Reyes, Héctor, Posgraduate Division, School of Dentistry, University of San Nicolás de Hidalgo, Morelia, México
Rukseree, Kamolchanok, Department of Sciences and Liberal Arts, Mahidol University, Amnat Charoen Campus, Amnat Charoen, Thailand

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