[4] M. Bluhm and B. K¨ ampfer, Phys. Rev. D 77 0344004 (2008), ibid. 77 , 114016 (2008); F.G. Gardim and F.M. Steffens, Nucl. Phys. A 825 , 222 (2009); F. Brau and F. Buisseret, Phys. Rev. D 79 , 114007 (2009). [5] M.I. Gorenstein and O.A. Mogilevsky, Z. Phys. C 38 , 161 (1988). [6] R.D. Pisarsky, Phys. Rev. D 74 , 121703 (2006); Prog. Theor. Phys. Suppl. 168 , 276 (2007). [7] V.V. Begun, M.I. Gorenstein, and O.A. Mogilevsky, in preparation. [8] M. Panero, Phys. Rev. Lett. 103 , 23200 (2009). 8