function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Fanti, Fabrizio', 1],
    ['Fanti, Fabrizio & Damgaard, Anders Leth', 2],
    ['Fanti, Fabrizio & Ghahari, Hassan', 1],
    ['KAZANTSEV, SERGEY V.', 7],
    ['Kazantsev, S. V.', 5],
    ['Kazantsev, Sergey V.', 2],
    ['Kiesenwetter, E. A. H. von', 1],
    ['PANKOWSKI, MAXIMILIAN G. & Fanti, FABRIZIO FANTI', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);