Results: (1) Success rate at the following times of placing the ball: 15 minutes: 93.3%, 95% CI [83.8 - 98.2]; 30 minutes: 93.3%, 95% CI [83.8 - 98.2]; 45 min: 95.0%, 95% CI [86.1 - 99.0]; 60 minutes: 100%.