“…Several risk factors have been proposed, such as radiation exposure in childhood (Schneider et al , 2008), loud noise (Edwards et al , 2006; Schlehofer et al , 2007; Hours et al , 2009), allergies (Schlehofer et al , 2007), epilepsy (Schoemaker et al , 2007), radiofrequency electromagnetic fields induced by long-term mobile phone use (Schoemaker et al , 2005; Ahlbom et al , 2009), high socioeconomic status (Schüz et al , 2010) and certain occupational exposures (Prochazka et al , 2010; Samkange-Zeeb et al , 2010). However, all these remain still tentative, owing to the lack of consistent evidence.…”