Methylphenidate does not restore the reduced serum BDNF levels in ADHD children by María-del-Carmen Augustin-Morales, María-José Ruiz-Ramos, Isabel Cubero-Millán, Laura Moreno-García, Fuensanta Justicia-Martínez, Ana Naranjo-Gómez, Eduardo Narbona-López, Antonio Molina-Carballo