function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chittaro, Yannick & Sanchez, Andreas', 1],
    ['Fanti, Fabrizio', 2],
    ['Fanti, Fabrizio & Damgaard, Anders Leth', 1],
    ['Fanti, Fabrizio & Ghahari, Hassan', 13],
    ['Herger, Peter & Germann, Christoph & Uhlig, Manfred', 1],
    ['Kiesenwetter, E. A. H. von', 1],
    ['Kuśka, Antoni & Kania, Iwona', 1],
    ['PANKOWSKI, MAXIMILIAN G. & Fanti, FABRIZIO FANTI', 2],
    ['Pankowski, Maximilian G. & Fanti, Fabrizio', 1],
    ['Pérez-Hernández, Cisteil Xinum', 1],
    ['Takahashi, Naoki', 3],
    ['Švihla, Vladimír', 6],
    ['Švihla, Vladimír & Mifsud, David', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=35)',
    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);