Agarose overlay selectively improves macrocolony formation and radiosensitivity assessment in primary fibroblasts. - Chandna, Sudhir; Dagur, Raghubendra Singh; Mathur, Ankit; Natarajan, Adayapalam Tyagarajan; Harms-Ringdahl, Mats; Haghdoost, Siamak (International Journal of Radiation Biology, 2014)