You've got to take patients as your main frame of reference--the readers are potential patients. For example, first introduce a story of a patient. Reader's Digest does a good job of doing this. They write about Old Chao's stomach or Old Chou's body.
以醫學知識為例，必須以病人為主體，讀者就是潛在的病人，譬如先介紹病人的故事，讀者文摘在這方面就做得不錯，他們寫過老周的胃、老周的身體之類的文章。