Efficacy of ultrasound-guided infiltration with levobupivacaine and triamcinolone for myofascial pain syndrome of the quadratus lumborum: a retrospective observational study by Anabela Barreto Silva, Nuno Malheiro, Belinda Oliveira, Diamantino Pereira, Filipe Antunes, Joana Borges, Ana Cristina Cunha

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