function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barahona-Segovia, Rodrigo M. & Barceló, Matías', 4],
    ['Bächli, Gerhard & Merz, Bernhard & Haenni, Jean-Paul', 2],
    ['El-Hawagry, Magdi & Soliman, Ahmed Mostafa', 5],
    ['Fabricius, Johann Christian', 1],
    ['Khaghaninia, Samad & Kazerani, Farzaneh', 2],
    ['Meigen, Johann Wilhelm', 10],
    ['Published, First', 2],
    ['Schlüsslmayr, Gerhard', 1],
    ['Sforzi, Alessandra & Sommaggio, Daniele', 3],
    ['Stuke, Jens-Hermann', 9],
    ['Stuke, Jens-Hermann & Clements, David K.', 13],
    ['Stuke, Jens-Hermann & Maeta, Yasuo', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=53)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);