function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ghahari, Hassan & Moulet, Pierre', 1],
    ['Ghahari, Hassan & Moulet, Pierre & Rider, David A.', 2],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 1],
    ['Jarvis, Charlie', 5],
    ['Kuehn, U.', 115],
    ['Maciel, Elisabete & Lillebø, Ana & Domingues, Pedro', 1],
    ['Pearse, A. S.', 1],
    ['Sukhorukov, Alexander P. & Fedorova, Alina V. & Kushunina, Maria', 4],
    ['Sukhorukov, Alexander P. & Kushunina, Maria', 3],
    ['Verloove, Filip', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=135)',
    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);