1 Center for Clinical Epidemiology and Biostatistics, School of Medicine and Public Health, University of Newcastle, Newcastle, NSW, Australia. Electronic address: jimmy.efird@stanfordalumni.org.
2 Center for Clinical Epidemiology and Biostatistics, School of Medicine and Public Health, University of Newcastle, Newcastle, NSW, Australia.
3 Department of Engineering, College of Engineering and Technology, East Carolina University, and RFPi, Inc., Greenville, NC, USA.