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Distribution of organisms in period 1 (1979–1992), period 2 (1993–2003) and period 3 (2004–2014); all variables are expressed as percentage; Abbreviation: MSSA, methicillin-sensitive Staphylococcus aureus; MRSA, methicillin-resistant Staphylococcus aureus; CNS, coagulase-negative staphylococci; MRSE, methicillin-resistant Staphylococcus epidermidis.
