Influence of Sitting and Supine Blood Pressure on the Pattern of 24-h Ambulatory Blood Pressure Clinical observation on the curative effects of traction at supine position or at sitting-dynamic-angle position on different kinds of cervical spondylosis 卧位与坐位血压变化对24小时动态血压类型的影响仰卧位和坐位动态成角牵引治疗各型颈椎病的疗效观察