Pregabalin Treatment Of Peripheral Neuropathic Pain Associated With Diabetic Peripheral NeP (DPN), Postherpetic Neuralgia (PHN), HIV-related NeP (HIV), and Chemotherapy Induced NeP

Inclusion Criteria: * Patients who are diagnosed with neuropathic pain associated with diabetic peripheral neuropathy, post-herpetic neuralgia, human immunodeficiency virus related peripheral neuropathy, and chemotherapy induced peripheral neuropathy. Exclusion Criteria: * Severe Pain associated with conditions other than Diabetic Peripheral Neuropathy, Post-Herpetic Neuralgia, Human Immunodeficiency virus related peripheral neuropathy, and chemotherapy induced peripheral neuropathy that may confound assessment or self evaluation of the neuropathic pain. * Skin Condition in the affected dermatome that (in the judgment of the investigator) could alter sensation.