function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['El-Hawagry, Magdi & Al Dhafer, Hathal Mohammed', 3],
    ['Ivkovic, Marija & Doric, Valentina & Baranov, Viktor', 3],
    ['Khaghaninia, S. & Kazerani, F. & Hauser, M.', 4],
    ['Mason, Franco & Rozkošný, Rudolf & Hauser, Martin', 3],
    ['Meigen, Johann Wilhelm', 6],
    ['Yang, Zaihua & Wei, Lianmeng & Yang, Maofa', 3],
    ['Zai-Hua, Yang & Jin-Yong, Yu & Mao-Fa, Yang', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=24)',
    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);