About the Authors

Paul H. Lee

paul.h.lee@polyu.edu.hk

Affiliation School of Nursing, Hong Kong Polytechnic University, Hong Kong, China

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: PHL. Performed the experiments: PHL. Analyzed the data: PHL. Contributed reagents/materials/analysis tools: PHL. Wrote the paper: PHL.