function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gadallah, Neveen S.', 14],
    ['Gadallah, Neveen S. & Abu El-Ghiet, Usama M.', 2],
    ['Gadallah, Neveen S. & Edmardash, Yusuf A.', 2],
    ['Jahantigh, Fatemeh & Rakhshani, Ehsan & Mokhtari, Azizollah', 14],
    ['Madl, M.', 8],
    ['Madl, Michael', 1],
    ['Madl, Michael & C, Bembecinus & F, Bembix & C, Brachystegus', 4],
    ['Mokrousov, M. V. & Proshchalykin, M. Yu. & Aliyev, Kh. A.', 6],
    ['Norfolk, Olivia & Dathe, Holger H.', 1],
    ['Schmid, C.', 19],
    ['Stetsun, Halyna', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=72)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);