For citations:
Nikitin V.A., Popov A.V., Titova L.A., Vasilyeva L.V., Tikhova Yu.S. Laser-ultrasonic technique for sputum expectoration in the treatment of chronic obstructive pulmonary disease. Laser Medicine. 2016;20(4):24-28. (In Russ.) https://doi.org/10.37895/2071-8004-2016-20-4-24-28
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