function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ghahari, Hassan & Mazur, Slawomir & Ostovan, Hadi', 6],
    ['Lackner, Tomas & Leschen, Richard A. B.', 5],
    ['Lackner, Tomáš', 7],
    ['Lackner, Tomáš & Seres, Gábor', 5],
    ['Lackner, Tomáš & Vienna, Pierpaolo', 1],
    ['Penati, Fabio', 8],
    ['Peschel, Rüdiger', 3],
    ['Webster, Reginald P. & Makepeace, Scott & DeMerchant, Ian', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=36)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);