docs: function shorthandFromCodesystem(cs) {
    if (!cs) {
      return '';
    }
  
    if (shorthands[cs]) {
      return shorthands[cs];
    } else if (cs.match(/http:\/\/standardhealthrecord.org\/shr\/[A-Za-z]*\/cs\/(#[A-Za-z]*CS)/)) {
      return '';
    } else {
      return cs;
    }
  }