1. Are computer and cell phone use associated with body mass index and overweight? A population study among twin adolescents Lajunen, Hanna-Reetta; Keski-Rahkonen, Anna; Pulkkinen, Lea; Rose, Richard; Rissanen, Aila; Kaprio, Jaakko 2007 Articles High technology--Health aspectsObesity--EtiologyBody mass indexOverweight teenagersEpidemiology