Authors: Karri Silventoinen; Sampo Sammalisto; Markus Perola; Dorret I Boomsma; Belinda K Cornes; Chayna Davis; Leo Dunkel; Marlies De Lange; Jennifer R Harris; Jacob V B Hjelmborg; Michelle Luciano; Nicholas G Martin; Jakob Mortensen; Lorenza Nisticò; Nancy L Pedersen; Axel Skytthe; Tim D Spector; Maria Antonietta Stazi; Gonneke Willemsen; Jaakko Kaprio Journal: Twin Res Date: 2003-10