Safe esophageal function testing during the COVID‐19 pandemic: A modified surgical mask for patients
2006 ◽
Vol 101
◽
pp. S375
2017 ◽
Vol 112
◽
pp. S214
2014 ◽
Vol 24
(4)
◽
pp. xiii-xiv
◽
2003 ◽
Vol 1
(3)
◽
pp. 174-182
◽