Endothelial Dysfunction, Monocyte Activation, and Vasculopathy in Patients with Obstructive Sleep Apnea and Effects of Six-month CPAP Treatment: A large scale double blind Randomized Placebo- controlled trial (II) 探討睡眠呼吸中止症病患內皮細胞功能障礙、單球細胞活化和血管病變的關聯，以及六個月連續陽壓呼吸器的效果---大型、雙盲、隨機及安慰劑控制的試驗 (II)