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. 2000 Apr 24;2000(2):CD002139. doi: 10.1002/14651858.CD002139

zo(sc) 55‐59 years.

Methods  
Participants  
Interventions  
Outcomes  
Notes  
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment (selection bias) Low risk A ‐ Adequate