Gutiérrez, José, and Carlos Singer. “Parkinsonism: Alternative Diagnosis Beyond Idiopathic Parkinson’s Disease”. Revista Médica Del Instituto Mexicano Del Seguro Social, vol. 48, no. 3, Jan. 2021, pp. 279-92, https://revistamedica.imss.gob.mx/index.php/revista_medica/article/view/1907.