function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['C. O & Madl, M. & Olmi, M.', 1],
    ['Danilov, Yu. N. & Odintseva, A. A. & Odintsev, O. A.', 1],
    ['Fabricius, Johann Christian', 1],
    ['Gadallah, Neveen S.', 35],
    ['Gadallah, Neveen S. & Abu El-Ghiet, Usama M.', 1],
    ['Gess, Friedrich W. & Gess, Sarah K.', 39],
    ['Jacobs, Hans-Joachim & Liebig, Wolf-Harald', 2],
    ['Jahantigh, Fatemeh & Rakhshani, Ehsan & Mokhtari, Azizollah', 22],
    ['Madl, M.', 3],
    ['Madl, Michael', 3],
    ['Madl, Michael & C, Bembecinus & F, Bembix & C, Brachystegus', 12],
    ['Mokrousov, M. V. & Proshchalykin, M. Yu. & Aliyev, Kh. A.', 7],
    ['Sadeghi, M. & Fallahzadeh, M. & Ostovan, H. & Ljubomirov, T.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=128)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);