Mark C Steinhoff, Mohamed Khalil Abd EI Khalek, Nagwa Khallaf, Hala Salah Hamza, Ahmed El Ayadi, Azza Orabi, Hala Fouad, Moamena Kamel,
Effectiveness of clinical guidelines for the presumptive treatment of streptococcal pharyngitis in Egyptian children The Lancet. ,vol. 350, pp. 918- 921 ,(1997) ,
10.1016/S0140-6736(97)03317-5