I’m having trouble finding credibility in that article in regard to anabolic steroids being the leading cause to the fibrosis and injury, fatigue, etc. of the kidneys. When you really dig into it, I would suspect that the kidneys and liver as well as associated action of them would be highly effected by the high protein diet, the pretty well unregulated and enormous amounts of supplements and creatine powders and those were likely the leading cause if failures. We all know the steroids will likely have played their role but this is exactly what the medical community does. Smear the steroid and neglect the other attributes. I’m willing to bet that if the same or similar study was done on all natural body builders following the same nutrition guidelines they would likely find similar results.