Two Transcutaneous Stimulation Techniques in Shoulder Pain: Transcutaneous Pulsed Radiofrequency (TPRF) vs. Transcutaneous Electrical Nerve Stimulation (TENS): Detailed Study - Lin, Mu-Lien; Chiu, Hung-Wei; Shih, Zao-Ming; Lee, Po-Ying; Li, Pei-Zhi; Guo, Chin-Hong; Luo, Yuan-Jie; Lin, Shen-Chieh; Lin, Kwan-Yu; Hsu, Yu-Ming; Pang, Angela; Pang, Weiwu (Emerging Research in Medical Sciences Vol. 4, 2020)