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Parathyroid hormone (PTH) levels by Dialysis Outcomes and Practice Patterns Study region and phase. Eur-A/NZ, Australia, Belgium, France, Germany, Italy, New Zealand, Spain, Sweden, and the United Kingdom; North America, Canada and the United States; phase 1, 1996–2001; phase 2, 2002–2004; phase 3, 2005–2008; phase 4, 2009–2011; phase 5, 2012 to present.
