Active vs. sham pulsed electromagnetic field therapy added to standardized conservative care for partial-thickness supraspinatus tears: study protocol for a randomized, assessor-blinded, sham-controlled trial. - Du, Tianzhu; Hu, Xu; Dan, Yu; Zhou, Yu; Liu, Hongyuan; Wang, Fei; Tao, Jun (Frontiers in Sports & Active Living, 2026)