Randomized Trial Comparing the Spasmolytic Effects of Nitroglycerin and Verapamil with Nitroglycerin Alone in Preventing Radial Artery Spasm during Cerebral Angiography. - Tiwari, Vivek Premshankar; Bhatia, Vikas; Kumar, Ajay; Aggarwal, Ashish; Chabra, Rajesh; Chauhan, Rajeev (Indian Journal of Neurosurgery, 2026)