Saito T, Chew ST, Liu WL, Thinn KK, Asai T, Ti LK. Br J Anaesth. 2016 Sep; 117 Suppl 1: i83-i86
By using previously reported derivation data, a score was validated in 5532 patients ranging between 0 and 7 points. Under this format, the authors conclude the scoring system to be easy to perform and reliable.
Link to abstract.