Challenges in Telemedicine and eHealth: Lessons Learned from 20 Years with Telemedicine in Tromsø. - Gunnar Hartvigsen; Monika Alise Johansen; Per Hasvold; Johan Gustav Bellika; Eirik Årsand; Eli Arild; Deede Gammon; Sture Pettersen; Steinar Pedersen (MedInfo, 2007)