Compliance to the study
27 national investigators were identified. They nominated the potential local investigators.
116 local investigators registered by the 22nd March 2010.
105/116 (91%) registered local investigators responded to the first survey.
88/116 (76%) registered local investigators responded to the second survey.
79/116 (68%) registered local investigators responded to the third survey.
87/116 (75%) registered local investigators responded to the forth and last survey.