Assertion: liposome's combination | /r/HasProperty | achieved since early 80s
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Source sentences:
text: In this case, collagen scaffolds were fabricated through introducing various chemical cross-linking agents (i.e., glutaraldehyde, formaldehyde, carbodiimide) or by physical treatments (i.e., UV irradiation, freeze-drying, and heating) [109, 114–117]. The combination of liposomes and collagen-based technologies has been long achieved since the early 80s .