(Q48755820)
Statements
1 reference
Characteristics of insomnia in the United States: results of the 1991 National Sleep Foundation Survey. I. (English)
1 reference
S Ancoli-Israel
1 reference
T Roth
1 reference
1 May 1999
1 reference
1 reference
22 Suppl 2
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S347-53
1 reference
Identifiers
1 reference