function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Azadbakhsh, Saeed & Nozari, Jamasb', 1],
    ['Dejean, P. F. M. A.', 1],
    ['Felix, Ron F. F. L. & Farkač, Jan & Suleiman, Ahmed Saeed', 1],
    ['Hristovski, Slavčo & Guéorguiev, Borislav', 1],
    ['Merene, Yeshitla & Lorenz, Wolfgang & Opgenoorth, Lars', 1],
    ['Teofilova, Teodora', 1],
    ['Wrase, DW', 2],
    ['Zimmermann, C. C. A.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=9)',
    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);