Article History
Received: 3 September 2018
Accepted: 15 April 2019
First Online: 8 May 2019
Compliance with ethical standards
: Institutional review board approval was obtained from Emory University and from each state cancer registry.
: The authors declare that they have no conflicts of interest.
: 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.
: Informed consent was obtained from all individual participants included in the study.