Department of Information Technology, Mid Sweden University, S-851 70, Sundsvall, Sweden.|Department of Information Technology, Mid Sweden University, S-851 70, Sundsvall, Sweden.|Department of Information Technology, Mid Sweden University, S-851 70, Sundsvall, Sweden.|Department of Information Technology, Mid Sweden University, S-851 70, Sundsvall, Sweden.|Department of Information Technology, Mid Sweden University, S-851 70, Sundsvall, Sweden.|Department of Information Technology, Mid Sweden University, S-851 70, Sundsvall, Sweden.