Unal-Cevik, I., Sarioglu-Ay, S., & Evcik, D. (2010). A comparison of the DN4 and LANSS questionnaires in the assessment of neuropathic pain: validity and reliability of the Turkish version of DN4.The Journal of Pain, 11(11), 1129-1135. doi:10.1016/j.jpain.2010.02.003