Pim Cuijpers1, Annemieke van Straten2. 1. Department of Clinical Psychology, VU University Amsterdam, 1081 BT Amsterdam, Netherlands; EMGO Institute for Health and Care Research, 1081 BT Amsterdam, Netherlands. Electronic address: p.cuijpers@vu.nl. 2. Department of Clinical Psychology, VU University Amsterdam, 1081 BT Amsterdam, Netherlands; EMGO Institute for Health and Care Research, 1081 BT Amsterdam, Netherlands.