Ultrasound-guided injection of platelet-rich plasma alleviated pain and improved function for individuals with myofascial pain syndrome: a retrospective case series study. - Ai, Shaolong; Xiang, Xiao-Na; Yu, Xi; Liu, Yan; Zhang, Kaibo; Zhang, Xuyang; Jiang, Hongying; Wang, Qian; He, Hong-Chen (BMC Musculoskeletal Disorders, 2025)