The Impact of Intermittent and Repetitive Cold Stress Exposure on Endoplasmic Reticulum Stress and Instability of Atherosclerotic Plaques di Ming-Xiang Dai, Xiao-Hui Zheng, Jin Yu, Tao Yin, Mei-Juan Ma, Le Zhang, Min Liu, Ying Ma, Li-Wen Liu, Xue Gao, Yan Li, Li-Qiang Song, Hai-Chang Wang