Adolescents' medicine use for headache: secular trends in 20 countries from 1986 to 2010

Bjørn E Holstein, Anette Andersen, Anastasios Fotiou, Inese Gobina, Emmanuelle Godeau, Ebba Holme Hansen, Ron Iannotti, Kate Levin, Saoirse Nic Gabhainn, Ulrike Ravens-Sieberer, Raili Välimaa, Medicine Use Writing Group