Pharmaceutical US Food and Drug Administration staffers posted a negative picture for German drug major Bayer (BAY: DE) and US partner Johnson & Johnson's (NYSE: JNJ) ahead of the September 8 Cardiovascular and Renal Drugs Advisory Committee meeting to discuss the New Drug Application for their Xarelto (rivaroxaban) tablets, for the prevention of stroke and systemic embolism (blood clots other than in the head) in patients with non-valvular atrial fibrillation (abnormally rapid contractions of the atria, the upper chambers of the heart). 7 September 2011