Fax: 1-888-353-9918. Email Address: office@n4hresearch.com. Office Hours: Mon. - Fri. 8:30AM to 5:00PM CST. **Preferred Parking: Patients are encouraged to park in the parking lot to the right of our house and come through the front door. Patients can park in any space, EXCEPT those reserved for CVS employees. Thank you..