Task: Answer Verification
Input (English): Question: Does long-term , low-dose lithium treatment impair renal function in the elderly : a 2-year randomized , placebo-controlled trial followed by single-blind extension?
Answer: Chronic use of lithium at low doses did not affect renal function and was clinically safe. However, some other potentially relevant adverse events were observed and others could not be ruled out due to limitations of the study design.
Output (English): no