Created with Raphaël 2.1.2
5.9
Not at all
5.0
10.0
15.0
20.0
25.0
30.0
Vey well
Well
Not well
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The first wave of interviews were conducted from October 2013 to March 2014, the second from October 2014 to February 2015, and the third from October 2015 to February 2016