Allocation concealment Adequate: concealed up to the point of treatment by central randomisation, sealed envelopes or similar. Unclear: the allocation concealment procedure was not described. Inadequate: open table of random numbers or similar.
Allocation concealment Adequate: concealed up to the point of treatment by central randomisation, sealed envelopes or similar. Unclear: the allocation concealment procedure was not described. Inadequate: open table of random numbers or similar.