Levels and Potential Health Hazards of Chlorinated Pesticides in Surface Water Samples of Charsadda Area of Pakistan Using SPME-GC-ECD Technique oleh Muhammad Ismail, Sultan Alam, Muhammad Sufaid Khan, Luqman Ali Shah, S. M. Mukaram Shah, Muhammad Wahab, Gul Rukh, Najeeb ur Rahman, Noor Rehman, Noor ul Amin, Juris Burlakovs, Anna Kallistova, Nikolai Pimenov, Zane Vincevica-Gaile, Yahya Jani, Muhammad Zahoor, Ivar Zekker