RT Journal Article SR Electronic T1 Novel method of locating the foramen ovale: a wobbly chair with shaky legs JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP rapm-2021-102569 DO 10.1136/rapm-2021-102569 A1 Jose Luis De Córdoba A1 Carlos García-Marqueta A1 Núria Isach YR 2021 UL http://rapm.bmj.com/content/early/2021/03/02/rapm-2021-102569.abstract AB