function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Beck, L. & Woas, S.', 1],
    ['Bolger, Thomas', 1],
    ['Ermilov, Sergey G. & Minor, Maria A.', 1],
    ['Fischer, Barbara M. & Schatz, Heinrich', 1],
    ['Hushtan, Habriel H. & Hushtan, Kateryna V. & Glotov, Sergii V.', 1],
    ['Mahunka, S.', 5],
    ['Migliorini, Massimo', 1],
    ['Murvanidze, Maka & Todria, Nino & Maraun, Mark & Mumladze, Levan', 1],
    ['Seniczak, Stanisław & Seniczak, Anna', 1],
    ['Weigmann, G. & Miko, L.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=14)',
    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);