Myotonic Dystrophy: Etiology, Clinical Features, and Diagnosis
UptoDate 2022 Jan, Darras, B.T., 2022
Early or Late Appearance of "Dropped Head Syndrome" in Amyotropic Lateral Sclerosis
JNNP 74:683-686, Gourie-Devi,M.,et al, 2003
Adult-Onset Nemaline Myopathy:Another Cause of Dropped Head
Muscle & Nerve 22:1146-1150, Lomen-Hoerth,C.,et al, 1999