A method for the authentication of an RFID tag uses an asymmetric cryptography method which ensures protection against the recycling of authentication RFID tags and needs no deactivation of the corresponding RFID tag for this purpose. The strategy assumes that a document contains a plurality of words and sentences that a restriction can be placed upon. In a further example, a correlation between the QRS-to-S2 interval and heart rate is established, and the MATR is based on the patient activity level and heart rate. In addition, a door hinge includes a first hinge part, a second hinge part pivotally connected to the first hinge part, and a removable door check device.