function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bächli, Gerhard & Merz, Bernhard & Haenni, Jean-Paul', 1],
    ['Eiseman, Charles S. & Lonsdale, Owen', 2],
    ['Eiseman, Charles S. & Lonsdale, Owen & Linden, John Van Der', 1],
    ['Guglya, Yuliia', 5],
    ['Lonsdale, Owen', 4],
    ['Schlüsslmayr, Gerhard', 1],
    ['erny, Milos & Baechli, Gerhard', 2],
    ['Černý, Miloš', 6],
    ['Černý, Miloš & Barták, Miroslav & Kubík, Štěpán & Vála, Miloslav', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=27)',
    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);