Impact of high hemoglobin levels on carotid artery intima–media thickness and its predictive value for hypertension in high-altitude areas: a real-world study - Hongyu, Long; Ga, Long; Yiqian, Zhang; Qiuyu, Xu; Kemin, Li; Maiyongcuo, Qing; Min, Xiong (Frontiers in Cardiovascular Medicine, 2025)