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Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, 9000 Ghent, Belgium; Centre for Nano- and Biophotonics, Faculty of Pharmaceutical Sciences, Ghent University, 9000 Ghent, Belgium; Univ Lille 1, Univ Lille Nord France, IEMN, UMR 8520, 59652 Villeneuve D'Ascq, France; Univ Lille 1, Univ Lille Nord France, Lab Phys Lasers Atomes & Mol, UMR 8523, 59655 Villeneuve D'Ascq, France. Electronic address: