AV loops anteromedial thigh flap autologous breast reconstruction breast reconstruction co-surgeon complex autologous breast reconstruction complications controlling nutritional status craniofacial microsomia deep inferior epigastric perforator flap end-to-side anastomoses four-flap free fibular flaps free flap free flap reconstruction head and neck head and neck reconstruction lumbar artery perforator flap microsurgery microsurgical reconstruction microvascular flap complications microvascular reconstruction n/a obstructive sleep apnea outcomes pediatric perforator flap plastic surgery profunda artery perforator flap reconstructive surgery