function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Huemer, Peter & Van Nieukerken, Erik J.', 6],
    ['Ivinskis, Povilas & Van, Erik J. & Rimsaite, Jolanta', 2],
    ['Jürg Schmid', 1],
    ['Kopp, Andreas & Keller, W. C. F.', 1],
    ['Landry, Bernard', 1],
    ['Navickaitė, Asta & Diškus, Arūnas & Stonis, Jonas R.', 5],
    ['van Nieukerken, Erik J. & Laštůvka, Aleš & Laštůvka, Zdenĕk', 24]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=40)',
    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);