From: A Dutch guideline for the treatment of scoliosis in neuromuscular disorders
Level 1 | At least one systematic review (A1) or at least 2 independent studies with evidence level A1 or A2 |
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Level 2 | At least two independent studies with evidence level B |
Level 3 | One study with evidence level A2 or B or multiple studies of level C |
Level 4 | Expert opinion |