put type="text" ng-model="namePrefix" required md-maxlength="57" ng-change="updateAnonymousPatientNames()">
                </md-input-container>
                <md-input-container>
                    <label>Numbering (Length)</label>
                    <input type="number" ng-model="numberingLength" min="1" max="6" required ng-change="updateAnonymousPatientNames()">
                </md-input-container>
                <md-input-container>
                    <label>Numbering (Start)</label>
           