Two participants (4%) did not respond after randomisation (one in each group) and three participants in the usual care group could not participate owing to illnesses unrelated to the cold weather.
The County of Nice declined to participate owing to "organisational restructuring", the Isle of Man pulled out because the UK government advises against travel to Abkhazia, and the Aymara people from South America could not travel after promised funding from the Chilean government did not come through, according to tournament organisers.
Syrian opposition activists fighting to topple the Assad regime have denounced the vote as a sham, as it is taking place during a bloody civil war, with an opposition unrepresented and unable to participate owing to a recently passed law barring those leading the revolt against the regime from competing, which will almost certainly result in Assad's re-election for a third seven-year term.
Others did not participate owing to lack of time, reorganization or other adverse organizational conditions.
However, we must bear in mind that many patients declined to participate owing to computer illiteracy or worries about their own capability to handle the assessment device.
Moreover, transfer students were unable to participate owing to the two-phase procedure, because the school and fiscal years in Japan begin in April.
Of the 30 centres invited, four did not participate owing to a withdrawal of interest or inability to complete agreements in time.
6 Four of the invited 34 sites did not participate owing to the investigator perceived hurdles with research ethics boards pertaining to informed consent.
19 As part of this, a short fixed-question survey was sent to every registered healthcare professional employed in the 19 DHBs (the 20th did not participate owing to demands of the Christchurch earthquakes).
Fifteen did not meet the inclusion criteria (12 because their stay was too short, and 3 because of insufficient mental capacity), 11 were not asked to participate owing to logistical issues.
We had a local team of interviewers at each of the 49 participating hospitals, but owing to the workload at public hospitals not all women could be approached and invited to participate, although we think this phenomenon happened randomly across the different hospitals.
