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Article History

Received: 11 October 2018

Accepted: 18 March 2019

First Online: 27 March 2019

Ethics approval and consent to participate

: Ethics approval was obtained from the RAND Human Subjects Protection Committee (HSPC), or Institutional Review Board (IRB). The HSPC is charged with ensuring the ethical treatment of individuals who are participants in RAND projects through observation, intervention, interaction or use of data about them. The HSPC serves as RAND’s Institutional Review Board (IRB) to review research involving human subjects. RAND’s Federalwide Assurance (FWA) for the Protection of Human Subjects (FWA00003425) serves as our assurance of compliance with federal regulations. According to this assurance, the HSPC is responsible for review of all research, regardless of the source of funding.​​ Every study participant provided written consent to participate in the study. In addition, they provided additional consent on completing accelerometry. Participants provided verbal assent prior to each measurement session and could withdraw at any time. All research was performed in accordance with the Declaration of Helsinki.

: Not applicable.

: All authors declare: no support from any organisation for the submitted work, no financial relationships with any organisations that might have an interest in the submitted work in the previous three years and no competing interest related to this work. No financial disclosures.

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