Footnotes

• Contributors AJP: Conceptualised and designed the study and questionnaire instrument, carried out the initial analyses, drafted the initial manuscript and approved the final manuscript as submitted. NF and DBA: Contributed to the design and analyses, critically reviewed and revised the manuscript and approved the final manuscript as submitted.

• Competing interests None declared.

• Ethics approval University of Wisconsin Institutional Review Board.

• Provenance and peer review Not commissioned; internally peer reviewed.