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Comparison of symptoms before and during COVID-19. a Patients who had undergone POEM before and during COVID-19. b Patients who had not undergone POEM before and during COVID-19. c Patients who had or not undergone POEM before COVID-19. d Patients who had or not undergone POEM during COVID-19. *p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001.
