Nasal colonization and bacterial contamination of mobile phones carried by medical staff in the operating room PLoS ONE 12(5): e017581. https://doi.org/10.1371/journal.pone.0175811 Chih-Hsiang Chang, Szu-Yuan Chen, Jang-Jih Lu, Chee-Jen Chang, Yuhan Chang, Pang-Hsin Hsieh*