Protocol: Weight-adjusted effective volume of 0.5% ropivacaine for combined costoclavicular brachial plexus block–cervical plexus blocks undergoing arthroscopic shoulder surgery: A dose-finding study protocol - Jianlin Wang; Liyong Yuan; Zhong Mei; Zhimin Sheng; Xiaolu Huang; Miao Zhu (PLoS ONE, 2025)