function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Germann, Christoph', 1],
    ['Germann, Christoph & Müller, Gerd & Müller, Ursula', 1],
    ['Ghahari, H. & A. A & Y. G', 1],
    ['Hoebeke, E. Richard & Griffin, Sean R.', 1],
    ['Legalov, A. A.', 6],
    ['Nazarenko, V. Yu.', 2],
    ['Skuhrovec, Ji Ř Í', 9],
    ['Skuhrovec, Jiří', 1],
    ['Yunakov, Nikolai & Nazarenko, Vitalij & Filimonov, Rostislav', 16]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=38)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);