From the Department of Medicine (M.T.J., M.A.M., W.A.G., M.L.K., B.R.H.), Department of Community Health Sciences (M.T.J., S.M.S., W.A.G., P.F., B.R.H.), and Department of Pediatrics (S.M.S.), University of Calgary, Calgary, Alberta, Canada; and Department of Medicine, University of Alberta, Edmonton, Alberta, Canada (M.T., N.P.). (2013-02時点)