Effects of a Food Containing Chicken Collagen Hydrolysate on Blood Pressure and Vascular Endothelial Function in Subjects with High—normal Blood Pressure and StageⅠ Hypertension ―A Randomized, Double—blind, Parallel—group, Placebo—controlled Trial― I-Ching Hou and et al., 薬理と治療, 45, 1333-1343 (2017), DOI:http://dx.doi.org/