What is the fine-grained topic of the following text: Shelley has been a Registered Nurse for over 30 years and has held a number of nursing positions such as Emergency room, Public Health Nurse in Clinical Services, Healthy Babies Healthy Children, School Health, Tobacco Prevention Diseases and Communicable Health and most recently as a Nursing Professor for the past 12 years. Only return the topic.
Shelley's Nursing Career and Experience