A randomized trial comparing the impact of a nonionic (Iomeprol) versus an ionic (Ioxaglate) low osmolar contrast medium on abrupt vessel closure and ischemic complications after coronary angioplasty - Schrader, R; Esch, I; Ensslen, R; Fach, WA; Merle, H; Scherer, D; Sievert, H; Spies, HF; Zeplin, HE (J Am Coll Cardiol, 1999)