Poly‐(
L
‐lactic acid) and citric acid‐crosslinked gelatin composite matrices as a drug‐eluting stent coating material with endothelialization, antithrombogenic, and drug release properties (Poly-(L-lactic acid) and citric acid-crosslinked gelatin composite matrices as a drug-eluting stent coating material with endothelialization, antithrombogenic, and drug release properties)