<qa>  What is the VAS instrument administered by the investigator or designee?When a subject is scheduled for a dressing change in the burn treatment room, the subject will be asked to rate their pain score using the Visual Analogue Scale VAS anchored by 0 representing no pain and 10 being the worst pain the patient has ever experienced. The VAS instrument will be administered by the investigator or designee within 4-12 hours prior to the dressing change procedure. Subjects will then be asked to rate their pain using the VAS within 4-12 hours after the end of the procedure. This will be repeated for every dressing change. 