2MajaniG, TiengoM, GiardiniA, etal. Relationship between MPQ and VAS in 962 Patients. A rationale for their use. Minerva Anestesi-ol. 2003,69 ( 1 - 2) :67 - 73.
3CohenIT. Using the visual analog scale. Anesthesiology. 2004,100 ( 6 ) 1621 :author reply 1621 - 1622.