RT Journal Article SR Electronic T1 Triage guidance for upper gastrointestinal physiology investigations during restoration of services during the COVID-19 pandemic JF Frontline Gastroenterology JO Frontline Gastroenterol FD BMJ Publishing Group Ltd SP 246 OP 248 DO 10.1136/flgastro-2020-101632 VO 12 IS 3 A1 Catherine Sykes A1 Helen Parker A1 Warren Jackson A1 Rami Sweis YR 2021 UL http://fg.bmj.com/content/12/3/246.abstract AB