Distributions of cadmium and lead levels in the intertidal clam Glauconome virens: a biomonitoring study by Yap, Chee Kong, Mat Rejab, Razeff Shardin, Cheng, Wan Hee, Kumar, Krishnan, H. Zakaly, Hesham M., Okamura, Hideo, Horie, Yoshifumi, Sharifinia, Moslem, Keshavarzifard, Mehrzad, Naji, Abolfazl, Ismail, Mohamad Saupi, Ong, Meng Chuan