Final answer:
Many medical offices use relationship marketing to improve customer service and retain patients by focusing on maintaining long-term relationships.
Step-by-step explanation:
Many medical offices use relationship marketing to market the practice and improve customer service. This approach focuses on building and maintaining long-term relationships with patients, as exemplified by personalized touches like sending birthday cards and implementing convenient services such as automated call distribution. Unlike traditional advertising which aims to attract new customers through broad strategies, or guerrilla marketing which often involves unconventional or surprise tactics, relationship marketing is about nurturing a continued connection with existing clients. Similarly, content marketing focuses on creating and distributing valuable content to attract a defined audience, which is not the primary method described in the question.