| Gonneke Willemsen | Amsterdam Public Health Research Institute, Vrije Universiteit Amsterdam |
| Eco J C de Geus | Amsterdam Public Health Research Institute, Vrije Universiteit Amsterdam |
| Jouke-Jan Hottenga | Amsterdam Public Health Research Institute, Vrije Universiteit Amsterdam |
| Dorret I Boomsma | Amsterdam Public Health Research Institute, Vrije Universiteit Amsterdam |