RT Journal Article SR Electronic T1 Regional anesthesia in predicted difficult airway: US strategy for SOS (standards of safety) JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP rapm-2020-101548 DO 10.1136/rapm-2020-101548 A1 Giuseppe Pascarella A1 Fabio Costa A1 Rita Cataldo A1 Romualdo Del Buono A1 Massimiliano Carassiti A1 Felice Eugenio Agrò YR 2020 UL http://rapm.bmj.com/content/early/2020/05/15/rapm-2020-101548.abstract AB