1. Center for Health Promotion Research and Development, The University of Texas Health Science Center at Houston, P.O. Box 20186 (W-902), Houston, TX 77225; phone: 713-500-9630; fax: 713-500-9602;
2. Center for Health Promotion Research and Development at the University of Texas Health Science Center, Houston
3. Feculty of Psychology, University of Maastricht, the Netherlands