Follow-up schedule over time, according to the stepped wedge cluster-randomized design.
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资源简介：
At day 1 of every three-monthly period a new cluster switches from the care as usual protocol (CAU) to the intensified follow-up protocol (CEA). Grey periods 1 and 2 represent the times questionnaires were sent (1st round September 2011, 2nd round June 2012).
创建时间：
2017-09-19
