Table 3. Study Participation by Year.

	Controls	Attrition	Transplant	Attrition
2004–05	n		n
1 y	24		58
2 y	23	1 no sample	58
3 y	22	1 no sample	53	2 deaths 3 no sample
2006–07
1 y	15		46
2 y	9	6 no sample	46
3 y	9		38	3 deaths 5 no sample
2008–09
1 y	23		47
2 y	23		47
2.5 y	21	2 no consent	34	7 no consent