1. School of Nursing, Qingdao University, Qingdao, China.
2. Department of Thoracic Surgery, The Affiliated Hospital of Qingdao University, Qingdao, China.
3. Department of Neurology, The Affiliated Hospital of Qingdao University, Qingdao, China.
4. Department of Vasculocardiology, The Affiliated Hospital of Qingdao University, Qingdao, China.
5. Department of Ophthalmology, The Affiliated Hospital of Qingdao University, Qingdao, China.
6. Cardiac Care Unit, The Affiliated Hospital of Qingdao University, Qingdao, China.
7. Department of Nursing, Laixi Municipal Hospital, Qingdao, China.
8. Office of the Dean, The Affiliated Hospital of Qingdao University, Qingdao, China.