Upon reviewing our published work, we had mistaken the explanation about sample preparation in the method and materials part.
To rectify this error, we have prepared the correct versions as shown below.
Sample preparation
The SPG used in this study was spray-dried powder extract from salmon nasal cartilage using 4% acetic acid (JUVECOL K, Lot. 212463). The proteoglycan content by the previously reported analysis method (Takahashi et al., 2018) was 21.5%, and the chondroitin sulfate contents was 215 mg/g, as analyzed according to the Health Functional Food Code of the Ministry of Food and Drug Safety, Korea. Collagen peptide (CP) obtained from Naturetech Co., Ltd. (Cheonan, Korea). JUVECOL K was provided by Ichimaru Pharcos, Co. Ltd (Gifu, Japan).