Funding for this research was provided by:
Social Trends Institute
National Institute of Child Health and Human Development (R24-HD041041)
Institute for Family Studies
Text and Data Mining valid from 2019-01-23
Received: 24 October 2017
Accepted: 20 December 2018
First Online: 23 January 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict 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 Declaration of Helsinki and its later amendments or comparable ethical standards”. Human subjects: this research involved human subjects, but is exempt from IRB review because it used only publically available data with no personal identifiers. (Exemption 4) Data available from: ExternalRef removed.
: The original collectors of the data obtained informed consent.