Ethical approval
This study in line with the declaration of Helsinki in 1964 and subsequent amendments was submitted to our institutional review board, and was accepted as a study of clinical practices.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Author contributions
CJ: conception and design, analysis and interpretation of data, preparation of the manuscript. PJC: analysis and interpretation of data, revising it critically for important intellectual content. ND: acquisition of data, analysis and interpretation of data. JB: acquisition of data, analysis and interpretation of data. CB: analysis and interpretation of data, revising it critically for important intellectual content. AD: conception and design, revising it critically for important intellectual content.