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Effectiveness of progressive muscle relaxation, deep breath..:

Toussaint, L ; Nguyen, Q.A ; Roettger, C...
https://eprints.whiterose.ac.uk/177973/1/Effectiveness%20of%20Progressive%20Muscle%20Relaxation,%20Deep%20Breathing,%20and%20Guided%20Imagery%20in%20Promoting%20Psychological%20and%20Physiologi.pdf.  , 2021