/**
 * Returns the first string value as a Javascript Number
 * @param element - The group/element of the element (e.g. '00200013')
 * @param [defaultValue] - The default value to return if the element does not exist
 * @returns {*}
 */
DICOMWeb.getNumber = function(element, defaultValue) {
  if(!element) {
    return defaultValue;
  }
  // Value is not present if the attribute has a zero length value
  if(!element.Value) {
    return defaultValue;
  }
  // Sanity check to make sure we have at least one entry in the array.
  if(!element.Value.length) {
    return defaultValue;
  }
  return parseFloat(element.Value[0]);
};