EFFICACY OF ULTRASOUND-GUIDED INTRAMUSCULAR ELECTROSTIMULATION IN CONJUNCTION WITH MOTOR CONTROL EXERCISES IN NON-SPECIFIC CHRONIC LOW BACK PAIN: A PILOT RANDOMIZED CLINICAL TRIAL. CDF [Internet]. 2021 Jun. 30 [cited 2025 Dec. 7];50(3):183-202. Available from: https://cuestionesdefisioterapia.com/index.php/es/article/view/65