52 patients with score of 12 or more on Leeds assessment of neuropathic symptoms and signs (LANSS) questionnaire will be included in the neuropathic pain group.

46 patients with scores less than 12 on LANSS will be included in the group without neuropathic pain.

The effect of neuropathic pain on quality of life, depression and sleep quality

The impact of pain on health-related quality of life will be assessed using the 36-Item Short Form Survey (SF-36). The validity and reliability of the Turkish version of SF-36 has been illustrated. SF-36 is a common questionnaire for the evaluation of quality of life, and it includes a total of 36 items in eight separate scales (physical functioning, general health, physical role, bodily pain, vitality, social functioning, mental health and emotional role). Each subscale is scored between 0 and 100, and high scores indicate better quality of life

Beck Depression Scale (BDS) will be used to evaluate depression status of the patients. Beck Depression Scale, which is a 21-item self report rating inventory, measures characteristic symptoms and attitudes of depression. The scale is scored between 0 and 63. The cut-off point considered is 17. Higher scores reflect more severe depression.

Quality of sleep will be assessed using the Pittsburgh Sleep Quality Index (PSQI), which assesses the individual's self-reported quality of sleep during the last month [9]. This 19-item index evaluates seven components of quality of sleep: subjective quality of sleep, sleep duration, sleep latency, sleep disturbances, sleep efficiency, drug use for sleep, and daytime dysfunction. A total PSQI score (range, 0-21) is the total of particular scores from the seven components. A score of ≥6 is considered to indicate poor quality of sleep. The Turkish validation of PSQI was performed.