Development and Validation of a Large Language Model–Powered Chatbot for Neurosurgery: Mixed Methods Study on Enhancing Perioperative Patient Education - Chung Man Ho; Shaowei Guan; Prudence Kwan-Lam Mok; Candice HW Lam; Wai Ying Ho; Calvin Hoi-Kwan Mak; Harry Qin; Arkers Kwan Ching Wong; Vivian Hui (Journal of Medical Internet Research)