public void addPatient(Patient2 newPatient) {
        if (this.isLast) {
            Patient2 first = nextPatient;
            nextPatient = newPatient;
            nextPatient.isFirst = false;
            nextPatient.nextPatient = first;
            this.isLast = false;
        } else {
            nextPatient.addPatient(newPatient);
        }
    }