Chiari I Malformations:Clinical and Radiologic Reappraisal
Radiology 183:347-353, Elster,A.D.&Chen,M.Y.M., 1992
Using the Berlin Questionnaire to Identify Patients at Risk for the Sleep Apnea Syndrome
Ann Int Med 131:485-491,535, Netzer,N.C.,et al, 1999