Postherpetic neuralgia(22) Pain(13) herpes zoster(10) Quality of life(8) Randomized controlled trial(6) paravertebral block(6) Acute herpes zoster(6) prevention(6) regional block.(6) cutaneous eruption(6) RCT(6) methylcobalamin(5) ultrasound-guided cervical nerve root block.(4) photophobia(4) acute zoster-associated pain(4) ITCH(4) stellate block(4) trigeminal neuralgia(4) herpes zoster burden of illness(4) sympathetic block(4) Post-herpetic neuralgia(4) craniofacial pain(4) randomized clinical trial(3) neuropathic pain(3) Sleep(3) subcutaneous injection(3) lumbar sympathetic block(3) prospective studies(3) Risk factors(3) acute ophthalmic herpetic neuralgia(3)