1. National Key Laboratory of Tunable Laser Technology, Harbin Institute of TechnologyHarbinPeople's Republic of China
2. Department of Electrical Engineering and AutomationAalto University School of Electrical EngineeringAaltoFinland
3. Department of InformaticsKing's College LondonLondonUK
4. Computer Science DepartmentKuwait UniversityKuwait CityKuwait