function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Baturina, N. S.', 1],
    ['Baturina, N. S. & Efstifeeva, S. S.', 1],
    ['Embacher, G. & Malicky, H. & A. E & R. A', 1],
    ['Malicky, H.', 4],
    ['Malicky, H. & Ivanov, V. & Melnitsky, S.', 1],
    ['Malicky, Hans', 1],
    ['Malicky, Hans & Laudee, Pongsak', 1],
    ['Mey, Wolfram & Malicky, Hans', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=12)',
    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);