[One of the authors responds:]
We tested 2 Furbies. Neither caused any effect on medical devices. We had no difficulties in obtaining the Furbies. We obtained one from the Canadian distributor in Montreal and the other from a friend. Many colleagues had offered to lend us their Furbies for testing. We used 4 Energizer alkaline batteries. The voltage of each battery was checked after each test to ensure that it had not fallen below 1.50 V DC (about 94% of the initial voltage). As we pointed out in our paper the electric and magnetic field strengths generated by the Furby were weak - not zero. The term "70 times weaker" means 1/70th the strength.