(b) Every multiphasic screening unit shall notify each person it tests that the person should contact the health provider to whom the test results are sent within 10 days and that the health provider may not be obligated to interpret the results or provide further care. The multiphasic screening unit shall include the words "PATIENT TEST RESULTS" on the envelope of any test results sent to a health care provider, and shall include the address of the person tested in the test result material sent to the health care provider. Nothing contained in this section shall relieve any health care provider from liability, if any, when at the time of receipt of the unsolicited referral there exists a provider-patient relationship, or a contract for health care services, or following receipt of such unsolicited referral there is established or reestablished a provider-patient relationship.