You agree that access to and use of the PHQ and GAD-7 screeners is at your own risk. Pfizer disclaims all warranties, express or implied, including warranties of merchantability or fitness for a particular purpose. Neither Pfizer nor any party involved in creating, producing, or delivering the PHQ/GAD-7 shall be liable for any damages, including without limitation, direct, incidental, consequential, indirect, or punitive damages, arising out of access to, use of or inability to use the PHQ/GAD-7, or any errors or omissions in the content thereof. This limitation includes damages to, or for any viruses that infect, your computer equipment.
Since the questionnaires rely on self-report, in the event of referral to a clinician all responses should be verified by the clinician and a definitive diagnosis made on clinical grounds, taking into account how well the patient understood the questionnaire, as well as other relevant information from the patient.