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. 2012 Mar 14;2012(3):CD005315. doi: 10.1002/14651858.CD005315.pub2

Koch 1998b.

Methods  
Participants  
Interventions  
Outcomes  
Notes See Table 8
Risk of bias
Bias Authors' judgement Support for judgement
Random sequence generation (selection bias) Unclear risk "Randomly assigned." Method of randomisation not described
Allocation concealment (selection bias) Unclear risk Not described.
Blinding (performance bias and detection bias) 
 Subjective outcomes High risk Patients aware of group allocation.
Blinding (performance bias and detection bias) 
 Objective outcomes Unclear risk Unclear if physiological measures were automated.
Incomplete outcome data (attrition bias) 
 All outcomes Unclear risk Withdrawals and dropouts not described.
Selective reporting (reporting bias) Unclear risk Unknown if selective outcome reporting.
Protection from contamination? Low risk Interventions administered on an individual basis.