Reliability and Validity of Fall Efficacy Scale-International in People with Parkinson’s Disease during On- and Off-Drug Phases oleh Maryam Mehdizadeh, Pablo Martinez-Martin, Seyed-Amirhasan Habibi, Seyed-Mohammad Fereshtehnejad, Amirabas Abasi, Javad Niazi Khatoon, Seyed Hassan Saneii, Ghorban Taghizadeh