REVIEWS

1. Role of trace mineral in periodontal health: a review
2. Clinical progress of cell therapy in treating age-related macular degeneration

RESEARCH ARTICLES

1. Hemodynamic responses of patients with stable coronary artery disease to a comedy film: study protocol for a randomized controlled trial
2. Tanreqing injection with ambroxol hydrochloride for heart failure and pulmonary infection in senile degenerative heart disease: a randomized controlled trial
3. Relationship between low vitamin D status and extra-skeletal diseases: a systematic review on effects of prophylaxis with vitamin D

EDITORIAL

1. CTDD call for papers