Instructions: Given an abstract, indicate which of the provided candidate titles (Option1 and Option2) best describes it (respond with the text of the title, not option1/2).
Input: Abstract: Records of 55 percutaneous renal biopsies performed in 53 children aged 5 days to two years were reviewed. Radiographic or ultrasound imaging techniques were not utilized during the biopsy procedure. Forty-nine of 55 biopsy attempts yielded sufficient tissue for histologic evaluation (89.1%). Transient gross hematuria not requiring intervention was the sole complication and was noted in 6 of 55 biopsy attempts (10.9%). Percutaneous renal biopsy can be performed safely in very young children and the success of the procedure is comparable to that in older children.
Which is the apt title for the abstract? option1: Percutaneous renal biopsy in infants and young children. option2: Relative responsiveness of cultured human epidermal melanocytes and melanoma cells to selected mitogens.
Output:
Percutaneous renal biopsy in infants and young children.