1. Elevation of serum angiotensin-converting-enzyme level in sarcoidosis;Lieberman;Am J Med,1975
2. Elevation of serum angiotensin-converting-enzyme level in sarcoidosis;Lieberman;Am J Med,1976
3. Serum angiotensin-converting enzyme for diagnosis and therapeutic evaluation of sarcoidosis;Lieberman;Am Rev Respir Dis,1979
4. Chronic fatigue syndrome: diagnostic criteria [letter];Bell;Ann Intern Med,1988
5. Chronic fatigue syndrome: a working definition;Holmes;Ann Intern Med,1988