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Article History

Received: 8 January 2018

Accepted: 21 August 2018

First Online: 29 August 2018

Ethics approval and consent to participate

: The NIS datasets are publicly available and anonymized. We aggregated the de-identified datasets at the national-level. The use of NIS datasets for research was determined to be exempt from review by the Duke University Health System Institutional Review Board.

: Not applicable.

: LTW also has received research funding from Patient-Centered Outcomes Research Institute and Alkermes Inc. HZ has no conflict of interest to disclose.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.