Surgical Trauma Evokes a Rise in the Frequency of Hematopoietic Progenitor Cells and Cytokine Levels in Blood Circulation. - Grzelak, I.; Olszewski, W.L.; Zaleska, M.; Ziolkowska, A.; Durlik, M.; Lagiewska, B.; Muszynski, M.; Rowinski, W. (European Surgical Research, 1998)