function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Dall, William Healey', 1],
    ['Frank, Christa', 10],
    ['Gould, A. A.', 1],
    ['Harzhauser, Mathias & Neubauer, Thomas A.', 1],
    ['Horsák, Michal & Pokryszko, Beata M.', 1],
    ['Moore, Charles', 1],
    ['Müller, Otto Friedrich', 1],
    ['Pease, W. H.', 5],
    ['Vavrová, Ľ. & Šteffek, J.', 3],
    ['Walther, Frank & Kijashko, Pavel V. & Hausdorf, Bernhard', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=25)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);