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A 16 year old girl arrives to the ED by ambulance and promptly delivers a 34 weeks by dates neonate. The infant is unresponsive, apneic, and you cannot palpate a pulse. After initial steps of drying, warming, and stimulating, the baby is still apneic with a heart rate < 100. You initiate positive pressure ventilation for 15 seconds but still do not hear the heart rate rising. Which of the following is not a part of the MR SOPA ventilation corrective steps recommended to try next?