1. Glogau RG. Fillers: paradigm shifts produce new challenges. In: Carruthers J, Carruthers A, editors. Soft tissue augmentation. Philadelphia: Elsevier; 2018. p. 3–6.
2. Fraser JR, Laurent TC, Laurent UB. Hyaluronan: its nature, distribution, functions and turnover. J Intern Med. 1997;242(1):27–33.
3. Soo-Keun L. Textbook of botulinum toxin and filler. 2nd ed. Seoul: Hanbibook Co; 2018. p. 233–42.
4. Stern R. Hyaluronan catabolism: a new metabolic pathway. Eur J Cell Biol. 2004;83(7):317–25.
5. Lim CY. Are the hyaluronic acid fillers safe? Filler Toxin. 2014;1(2):6–9.