function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Kment, Petr & Kolínová, Zdislava', 3],
    ['Nieser, Nico & Chen, Pingping', 5],
    ['Pelingen, Arthien Lovell & Zettel, Herbert', 2],
    ['Polhemus, John T.', 7],
    ['Zettel, Herbert & Tran, A. D.', 1],
    ['Zettel, Herbert & ek, Miroslav Papá & Kovac, Damir', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);