https://www.selleckchem.com/products/prostaglandin-e2-cervidil.html 92/5 and 4.59/5 respectively (5-level Likert scale). The construct/face/content validity of the proposed modules have been verified. Most of the modules tested here were physically not realistic, but they were all rated as highly relevant for surgical training by the participants. The construct/face/content validity of the proposed modules have been verified. Most of the modules tested here were physically not realistic, but they were all rated as highly relevant for surgical training by the participants. Systematic review of the literature on myringoplasty techniques without tympanomeatal flap elevation in children. A systematic review following PRISMA guidelines reported papers on patients under 18years of age undergoing myringoplasty for chronic tympanic perforation on a transcanal approach without tympanomeatal flap elevation. Tympanic closure rates and audiometric results were analyzed. Twenty studies were included. Nine reported the butterfly technique, using a microscope or endoscope, with closure rate of 82.3% (246/299), for perforations of various sizes. Ten reported the fat-plug technique, with closure rate of 86.8% (869/1001), mostly for perforations of less than one-third of the tympanum. Both techniques improved audiometric results. Morbidity was very low. The absence of chronic otitis or co-morbidities (contralateral otitis media with effusion, craniofacial malformations, Down's syndrome) implies that patient selection technique may be necessary to obtain the best results. Fat-plug myringoplasty, for small perforations, and butterfly cartilage myringoplasty seem to be reliable procedures in selected patients, with low morbidity in children. Fat-plug myringoplasty, for small perforations, and butterfly cartilage myringoplasty seem to be reliable procedures in selected patients, with low morbidity in children. The UTD Classification System risk stratifies postnatal UTD into three groups