function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Guo, Mingxia & Xing, Lida & Wang, Bo & Zhang, Weiwei', 2],
    ['Ivkovic, Marija & Doric, Valentina & Baranov, Viktor', 1],
    ['Kolcsar, Levente-Peter & Oosterbroek, Pjotr', 7],
    ['Obona, Jozef & Stary, Jaroslav & Manko, Peter & Hrivniak, Ľubos', 1],
    ['Ribeiro, Guilherme C. & Santos, Daubian', 3],
    ['Stary, Jaroslav & Rohacek, Jindrich', 1],
    ['Theischinger, Günther & Billingham, Zacariah D. & Martin, John', 14]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=29)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);