Retropharyngeal Abscess
Emedicine.medscape.com Jan, Kahn, J.H. & Shlamovitz, G.Z., 2017
Parkinsonism-Recognition and Differential Diagnosis
BMJ 310:447-452, Quinn,N., 1995
Respiratory Distress & Arnold-Chiari Malformation
Neurol 31:97-100, Papasozomenos,S.,et al, 1981