Article History
First Online: 2 January 2019
Compliance with ethical standards
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: T. M. Gu and D. E. Sabath declare they have no conflict of interests. D. A. Garcia has received research support from Daiichi Sankyo and consulting fees from Janssen.
: This was a retrospective study approved by the institutional review board at University of Washington Medicine. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: For this type of study formal consent is not required.