Table 1.

Inclusion and exclusion criteria used for selecting the participating facilities and rationale for each

	Criterion	Rationale
Inclusion	1. Located within the continental United States.	VHA facilities outside the continental United States do not reliably report electronic medical record data to the CDW and/or do not have dermatology clinics.
	2. Greater than zero provider full-time equivalents practising dermatology.	Have a dermatology clinic on-site.
	3. Higher than 0.1% and at most 8.8% of total FY2016 dermatology encounters at the facility were for teledermatology readings.	Already performing some teledermatology consults at baseline using the existing store-and-forward technology, but their total teledermatology encounter rates were below the median; based on prior experience, these sites were judged to be good candidates for implementing the new mobile app.
Exclusion	Participating in pretrial mixed-methods formative evaluation.	Three facilities will participate in the formative evaluation, which will be conducted to inform the implementation of the mobile app; these facilities are located in Providence, RI, San Francisco, CA, and Denver, CO.

CDW, Corporate Data Warehouse; FY, fiscal year; VHA, Veterans Health Administration.