function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Erichson, Wilhelm Ferdinand', 1],
    ['Ghahari, Hassan & Mazur, Slawomir & Ostovan, Hadi', 1],
    ['Lackner, Tomáš & Vienna, Pierpaolo', 1],
    ['Leschen, Richard A. B. & Ôhara, Masahiro', 1],
    ['Mazur, S. & A. V & A. V', 2],
    ['Mazur, Sławomir & V, Alexey & V, Alexander & Barševskis, Arvids', 1],
    ['Penati, Fabio', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=8)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);