The injection was prepared using a solution of lidocaine 2% and saline 0.9%. A 0.4% lidocaine solution was prepared by diluting 1 cc of lidocaine with 4 cc of saline.

A scale between 0 and 10 was used to question the pain level.

The questionnaire consists of 9 items and is completed by the patient (no clinical examination is required)[1][3]. There are 7 weighted sensory descriptor items (never to very strongly) and 2 items relating to spatial and temporal pain characteristics[3]. A total score of 19 or more is indicative of likely neuropathic pain.

The SF-12 is a self-reported outcome measure assessing the impact of health on an individual's everyday life. It is often used as a quality of life measure.

The 5-D itch scale is a 5-domain disease-specific instrument evaluating the duration, degree (severity), direction (improving, unaltered or worsening), disability (impact on sleep, leisure/social, housework/errands and school/work activities) and distribution (body part affected)