| Hamdi Mbarek | Department of Biological Psychology,Amsterdam Public Health Research Institute,Vrije Universiteit Amsterdam,Amsterdam,the Netherlands. |
| Jouke-Jan Hottenga | Department of Biological Psychology,Amsterdam Public Health Research Institute,Vrije Universiteit Amsterdam,Amsterdam,the Netherlands. |
| Eco J C de Geus | Department of Biological Psychology,Amsterdam Public Health Research Institute,Vrije Universiteit Amsterdam,Amsterdam,the Netherlands. |
| Gonneke Willemsen | Department of Biological Psychology,Amsterdam Public Health Research Institute,Vrije Universiteit Amsterdam,Amsterdam,the Netherlands. |
| Johannes H Smit | Department of Psychiatry,Amsterdam Public Health Research Institute,VU University Medical Center/GGz inGeest,Amsterdam,the Netherlands. |
| Dorret I Boomsma | Department of Biological Psychology,Amsterdam Public Health Research Institute,Vrije Universiteit Amsterdam,Amsterdam,the Netherlands. |
| Brenda W J H Penninx | Department of Psychiatry,Amsterdam Public Health Research Institute,VU University Medical Center/GGz inGeest,Amsterdam,the Netherlands. |