Author contributions
AAB and KAB conceived the study and study design. AAB, KAB, MS and DG
performed the title, abstract and full-text screening and data
extraction. AAB and KJ performed data analysis. AAB wrote the initial
draft of the manuscript. AAB, DG, MS, KJ, JN, HML, BW and KAB discussed
the results, provided interpretation, reviewed the manuscript and
provided critical comments.