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For questions regarding GSK CPSIA Certificates please contact GlaxoSmithKline Customer Response Center at 1-888-825-5249. GlaxoSmithKline's Customer Response Center's hours of operation are from Monday through Friday, 8:00am - 8:00pm, Eastern Time. The Customer Response Center is not operational on the weekends or during holidays. http://us.gsk.com/en-us/contact-us