Day from first contact attempt	Two-stage SMM	Three-stage SMM	On-site distribution	Mail notification of web survey	Email notification of web survey
0	Mailed survey	Emailed link to survey	Distributed survey	Mailed URL and PIN	Emailed link
5	--	Mailed survey	--	--	Second emailed link
10	--	--	--	--	Third emailed link
21	Phone outreach started+	--	--	Second mailed URL and PIN	--
26	--	Phone outreach started+	--	--	--