BiofilmsStaphylococcus epidermidisStaphylococcus aureusCatheter-Related InfectionsStaphylococcal InfectionsCatheterization, Central VenousPseudomonas aeruginosaPseudomonas InfectionsColony Count, MicrobialProsthesis-Related InfectionsAnti-Bacterial AgentsMicrobial Sensitivity TestsBacterial AdhesionGene Expression Regulation, BacterialPlanktonBacterial Proteins