Key points are not available for this paper at this time.
Trialregister.nl NTR3483; http://www.trialregister.nl/trialreg/admin/rctview.asp?TC=3483 (Archived by WebCite at http://www.webcitation.org/6NWZqon3o).
Bruggeman-Everts et al. (Thu,) studied this question.