1. Effect of laughter on salivary endocrinological stress marker chromogranin A
   Masahiro TODA et al, 2007, Biomedical Research CrossRef
2. Associations of Frequency of Laughter With Risk of All-Cause Mortality and Cardiovascular Disease Incidence in a General Population: Findings From the Yamagata Study
   Kaori Sakurada et al, 2020, Journal of Epidemiology CrossRef
3. Learning from Normal Aging:Preserved Emotional Functioning Facilitates Adaptation among Early Alzheimer’s Disease Patient
   Fan Zhang et al, 2015, Aging and Disease CrossRef
4. Laughter yoga as an enjoyable therapeutic approach for glycemic control in individuals with type 2 diabetes: A randomized controlled trial
   Mayumi Hirosaki et al, 2023, Frontiers in Endocrinology CrossRef
5. The Impact of Humor on Patients With Cancer
   Wanda Christie et al, 2005, Clinical Journal of Oncology Nursing CrossRef
6. Healing through faith: meeting a chaplain coupled with biblical readings could produce lymphocyte changes that correlate with brain activity (HEALING study)
   András Béres et al, 2022, F1000Research CrossRef
7. Laughter up-regulates the genes related to NK cell activity in diabetes
   Takashi HAYASHI et al, 2007, Biomedical Research CrossRef
8. SIGNIFICANCE OF CHANGES IN CIRCULATING IMMUNOCOMPETENT CELLS
   RYOICHI NAGATOMI, 2005, Japanese Journal of Physical Fitness and Sports Medicine CrossRef
9. Laughter Lowered the Increase in Postprandial Blood Glucose
   Keiko Hayashi et al, 2003, Diabetes Care CrossRef
10. Association between Laughter and Lifestyle Diseases after the Great East Japan Earthquake: The Fukushima Health Management Survey
    Eri Eguchi et al, 2021, International Journal of Environmental Research and Public Health CrossRef
11. Gratitude in Long Term Care
    Brooke Abrams Sunding, 2015, Journal of Psychology & Clinical Psychiatry CrossRef