Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: John G. Webb reports a relationship with Edwards Lifesciences Corporation that includes: consulting or advisory and funding grants. John G. Webb reports a relationship with Medtronic Inc. that includes: funding grants. John G. Webb reports a relationship with Boston Scientific Corporation that includes: funding grants. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.