UK Cochrane Centre;
Oxford;
United Kingdom Centre for Statistics in Medicine;
Wolfson College;
Oxford University;
Oxford;
United Kingdom;
UK Cochrane Centre;
Oxford;
United Kingdom School of Nursing and Midwifery;
Trinity College Dublin;
Dublin;
Ireland;
Chalmers Research Group;
Children's Hospital of Eastern Ontario Research Institute;
Ottawa;
Canada Department of Epidemiology and Community Medicine;
Faculty of Medicine;
University ot Ottawa;
Ottawa;
Canada;
Sideview;
Princes Risborough;
United Kingdom;
Discipline of Obstetrics and Gynaecology;
The University of Adelaide;
Adelaide;
Australia;
Centre for Statistics in Medicine;
Wolfson College;
Oxford University;
Oxford;
United Kingdom;
Family Health International;
Research Triangle Park;
North Carolina;
United States of America;
北京中医药大学循证医学中心;