Roles and responsibilities
TASK	WHO HAS UNDERTAKEN THE TASK
Drafted the protocol	Gabriela Cormick/Agustín Ciapponi/ José M Belizán
Developed a search strategy	Gabriela Cormick/Agustín Ciapponi
Selected which trials to include (2 people + 1 arbiter in the event of dispute)	Gabriela Cormick/María Luisa Cafferata/Agustín Ciapponi
Extracted data from trials (3 people)	Gabriela Cormick/María Luisa Cafferata/Agustín Ciapponi
Entered data into RevMan (Cochrane software)	Gabriela Cormick/Agustín Ciapponi
Carried out the analysis	Gabriela Cormick/Agustín Ciapponi
Interpreted the analysis	Gabriela Cormick/Agustín Ciapponi/ María Luisa Cafferata/José M Belizán
Drafted the final review	Gabriela Cormick/Agustín Ciapponi/María Luisa Cafferata/José M Belizán
Responsible to keep the review up to date	Gabriela Cormick/Agustín Ciapponi/ María Luisa Cafferata