Patients were randomly assigned to either the target or<br>control group using block randomization. The selection<br>was performed using a computer-generated random list<br>of numbers. Randomization sequence was accessible to<br>assessors of the main outcome parameters only. The patients and assessors of clinical tests were masked to the treatment allocation. Individual RSS intervention was<br>conducted and monitored by therapists, who had<br>received a detailed instruction in handling RSS procedures.
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