The phrase “cash is king” may not have the same ring as it used to, now that more than 40% of Americans, per the Pew Research Center, regularly go a week or more without paying for anything using ...

Correspondence to Dr Brent E Hagel, Department of Paediatrics, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada; brent.hagel{at}albertahealthservices.ca Background ...