Departments of Epidemiology and of Neurology & Neurological Sciences, Stanford University, Stanford, CA

Address correspondence to: Victor W. Henderson, MD, MS, Stanford University School of Medicine, Stanford, CA. E-mail: [email protected]edu

Received 20 June, 2019

Revised 21 June, 2019

Accepted 21 June, 2019

Funding/support: None reported.

Financial disclosure/conflicts of interest: None reported.