London Pulse maintained their perfect start to the Netball Super League season as they beat Birmingham Panthers for their a fifth straight win.Pulse led narrowly at half-time before running out 68-58 winners, though this was the first time this season that they have failed to score 70 or more points.The match was paused for just over 20 minutes in the third quarter when Panthers centre Gabby Marshall hit the back of her head in a fall and was taken to hospital.Marshall collided with Pulse goalke