Table 1.

Oncofertility Collaboration Tie Changes

	Tie Change
	0 → 0	0 → 1	1 → 0	1 → 1
From t1 = 2007 to t2 = 2008	914319	1038	520	104
From t2 = 2008 to t3 = 2009	913595	1244	1042	100
From t3 = 2009 to t4 = 2010	913068	1569	1236	108