A national perspective on exposure to essential surgical procedures among medical trainees in Nigeria: a cross-sectional survey and recommendations od KingPriest, PT, Alayande, BT, Clement, EW, Muhammed, M, Egbiri, JO, Shanabo, M, Osayande, EK, Atunrase, AA, Abubakar, JI, Eze, DC, Adekoya, S, Chiroma, GB, Aikhuomogbe, OM, Gaila, FS, Yaga, D, Thomas, NN, Chukwunta, CA, Hey, MT, Forbes, C, Riviello, RR, Ismaila, BO