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  NHLBI Center for Health Information
      Contact CHI
        
            NHLBI’s Center for Health Information (CHI) is open Monday through Friday, 8:30 a.m. to 5 p.m. ET (closed on Federal holidays). After hours, you may leave a voicemail message or send an email, and your inquiry will be answered by our information specialists the next business day.
      
                          Last updated July 13, 2023

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