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;

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Which psychosocial factors are related to severe pain and functional limitation in patients with low back pain? Leticia Amaral Corrêa; Stephanie Mathieson; Ney Armando de Mello Meziat-Filho; Felipe José Reis; Arthur de Sá Ferreira; Leandro Alberto Calazans Nogueira;