4.1. Authors contributions
Lopez-Marco A and Mehta D made substantial contribution to conception and design of the study. The data acquisition was performed by Lopez-Marco A and Syed A. Phillips M, Williams J, George J, Hogan J and Mansoor J contribution consisted on conducting the follow-up interviews and collecting that pertinent data. The data analysis and interpretation was done by Lopez-Marco A, along with the expertise of the statistician Ghebre M.