CFP and complement deficiency: Twelve articles were excluded for varying reasons; these articles included vaccine clinical trials (1), case studies with complement deficiency or properdin deficiency (2), molecular characterisation studies (3), unusual clones (1), genomic database comparison (1), humanised mice studies (1), Umrah pilgrim carriage studies (1), a comparison of MenA in Greece (1) and a 3-year surveillance study of meningococcal disease in Argentinian children (1).