Frontal Recess Cells in International Frontal Sinus Anatomy Classification (IFAC); Prevalence, Infection Incidence, and Relation to Frontal Sinus Infection in Chronic Sinusitis Patients. - Nofal, Ahmed Abdelfattah Bayomy; El-Anwar, Mohammad Waheed (Indian Journal of Otolaryngology & Head & Neck Surgery (Springer Nature), 2022)