function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bächli, Gerhard & Merz, Bernhard & Haenni, Jean-Paul', 1],
    ['Denes, Avar-Lehel & Kolcsar, Levente-Peter & Toeroek, Edina', 5],
    ['Ivkovic, Marija & Doric, Valentina & Baranov, Viktor', 1],
    ['Kolcsar, Levente-Peter & d\'Oliveira, Micha Camiel', 4],
    ['Obona, Jozef & Stary, Jaroslav & Manko, Peter & Hrivniak, Ľubos', 1],
    ['Petersen, Matthew J.', 2],
    ['Ujvárosi, Lujza & Bálint, Miklós', 2],
    ['Ÿ, Jaroslav Star & Oosterbroek, Pjotr', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    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);