function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bueno-Villegas, Julián & Sierwald, Petra', 1],
    ['Decker, Peter & Reip, Hans Simon & Voigtlaender, Karin', 2],
    ['Golovatch, Sergei I. & Wesener, Thomas', 2],
    ['Hollier, John & Stöckli, Eduard & Wesener, Thomas', 28],
    ['Iniesta, Luiz Felipe Moretti & Bouzan, Rodrigo Salvador', 1],
    ['Wesener, Thomas & Enghoff, Henrik & Sierwald, Petra', 14]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=48)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);