function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Boeters, Hans D. & Falkner, Gerhard', 1],
    ['Brusina, S.', 1],
    ['Esu, Daniela & Girotti, Odoardo & Truc, Georges', 2],
    ['Gittenberger, Edmund & Gyeltshen, Choki & Stelbrink, Bjoern', 2],
    ['Gittenberger, Edmund & Leda, Pema & Wangchuk, Jigme', 7],
    ['Gittenberger, Edmund & Sherub, Sherub & Stelbrink, Bjoern', 3],
    ['Harzhauser, Mathias & Neubauer, Thomas A. & Mandic, Oleg', 1],
    ['Radea, Canella & Parmakelis, Aristeidis', 1],
    ['Sitnikova, Tatiana & Kovalenkova, Maria & Peretolchina, Tatiana', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);