function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barlow. J.', 1],
    ['Boano, Giovanni & Belemsobgo, Urbain & Silvano, Fabrizio', 2],
    ['Cretzschmar, Philipp Jakob', 1],
    ['Eames, Jonathan C & Trai, Le Trong & Cu, Nguyen & Eve, Roland', 1],
    ['Frahnert, Sylke & Turner, Donald A. & Bracker, Cordula', 3],
    ['Kumar Arya, Sumit & Gopi, Govindan Veeraswami', 1],
    ['Mary & Croy', 3],
    ['Mlíkovský, Jiří', 1],
    ['Paperna, Ilan & Keong, Malcolm Soh Chu & May, Charlotte Yap Aye', 7],
    ['V. v., Robin & C. K., Vishnudas & Rheindt, Frank E', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    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);