Efficacy and safety of interferon-alpha 1b injection into the intervertebral foramen with ultrasonic guidance in patients with postherpetic neuralgia: study protocol for a randomiz... by Hui-Min Hu, Hui-Min Hu, Wen-Hui Liu, Wen-Hui Liu, Chen Li, Chen Li, Qing Shi, Qing Shi, Chun-Hua Liu, Chun-Hua Liu, An-Xiang Liu, An-Xiang Liu, Yi-Fan Li, Yi Zhang, Peng Mao, Bi-Fa Fan

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