The effects of anxiety and external attentional focus on postural control in patients with Parkinson's disease. oleh Seyede Zohreh Jazaeri, Akram Azad, Hajar Mehdizadeh, Seyed Amirhassan Habibi, Mahbubeh Mandehgary Najafabadi, Zakieh Sadat Saberi, Hawre Rahimzadegan, Saeed Moradi, Saeed Behzadipour, Mohamad Parnianpour, Ghorban Taghizadeh, Kinda Khalaf