Patients who fulfilled the study criteria were invited
to participate. After enrolement and two
weeks of run-in, patients were randomized into
the Resperate group (n = 32) or the CD group
(n = 22). For randomization, fifty cards marked CD
and fifty marked Resperate were placed in envelopes,
which were sealed, shuffled like a deck of
cards and then numbered from 1 to 100.