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Acknowledgements
We thank the staff who maintain the JTDB and all personnel at the participating institutions who facilitated the
data. We thank Katrina Krogh, MD, and Kelly Zammit, BVSc, from Edanz Group (www.edanzediting.com/ac),
for editing a draft of this manuscript.
Author contributions
W.I. designed the study, analysed the data, and drafted the manuscript. M.H. designed the study and drafted the
manuscript. A.T. analysed the data. M.B analysed the data and performed statistical analyses. R.I. reviewed the
work critically for important intellectual content.
Competing interests
The authors declare no competing interests.
Additional information
Correspondence and requests for materials should be addressed to W.I.
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