Table 1.

Modifications to protocol

Date Approved	Modification
September 2016	Revised eligibility criterion; increased incentive amounts
October 2016	Addition of Certificate of Confidentiality
December 2016	Changed type of drug screening test used; addition of participant stamp card; inclusion of risk-reduction materials for YWC arms
June 2017	Revised eligibility criterion
August 2017	Addition of peer consultant program to assist in recruitment of potential participants for study participation
December 2017	Changed study design from a three-arm parallel group design to a three-arm crossover design; added referral prompts to survey instrument and updated consents to reflect change
January 2018	Changed distressed respondents’ protocol about who to contact