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The methodological quality of clinical trials of physical therapy for low back pain varies between countries with different income levels. A meta-epidemiological study Carlos Maximiliano Sánchez Medina; Claudia Gutiérrez Camacho; Anne M. Moseley; Xochiquetzalli Tejeda Castellanos; Qiuzhe Chen; Edgar Denova-Gutiérrez; Aidan G Cashin; Viridiana Valderrama Godínez; Akari Fuentes Gómez; Ana Elisabeth Olivares Hernández; Giovanni E. Ferreira;