Month                 Activity

                   1 – 2                     Preparation of protocol.

                   3 – 8                     Searches for published and unpublished studies.

                   2 – 3                     Pilot test of eligibility criteria.

                   3 – 8                     Inclusion assessments.

                   3                          Pilot test of ‘Risk of bias’ assessment.

                   3 – 10                   Validity assessments.

                   3                          Pilot test of data collection.

                   3 – 10                   Data collection.

                   3 – 10                   Data entry.

                   5 – 11                   Follow up of missing information.

                   8 – 10                   Analysis.

                   1 – 11                   Preparation of review report.

                   12 –                      Keeping the review up-to-date.