<human>:  I have a question about PHRs. Personal health records. How do they work?
<bot>: A PHR is a system that allows you to store and manage your health information. It can be used to store information about your medical history, your medications, your allergies, your immunizations, and your health goals. It can also be used to store information about your family members, such as their medical history, allergies, and immunizations.