Scleral buckling versus primary vitrectomy in rhegmatogenous retinal detachment (SPR Study): Design issues and implications. SPR Study Report No. 1. - Heimann,H.; Hellmich,M.; Bornfeld,N.; Bartz-Schmidt,K.U.; Hilgers,R.D.; Foerster,M.H. (Graefe's Arch Clin Exp Ophthalmol, 2001)