A bandanna-style head covering having a crown portion, a tail member, a pair of tie members, and a receptacle mounted to the interior of the crown portion, the opening of the receptacle being closed by folding forward the tail member. A nutritional composition which includes whey protein, or a protein mixture which simulates the amino acid profile of whey protein, as a protein source is enterally administered to the patient. The invention furthermore relates to a process for preparing the abovementioned PNA derivatives and to their use as pharmaceuticals and diagnostic agents. Communication between Bluetooth and FM channels may be enabled via a single chip.