function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cao, Tong & Váňa, Jiŕí & Söderström, Lars & Hagborg, Anders', 1],
    ['Gradstein, S. Robbert & Pérez, Álvaro J.', 1],
    ['Jarvis, Charlie', 5],
    ['Pioli, Achille', 1],
    ['Söderström, Lars & Hagborg, Anders & Konrat, Matt Von', 12],
    ['Vana, Jiri & Hentschel, Joern & Mueller, Jochen', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=25)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);