function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Buchner, Peter & Corley, Martin & Junnilainen, Jari', 4],
    ['Buchner, Peter & Šumpich, Jan', 1],
    ['Corley, Martin & Ferreira, Sónia', 3],
    ['Dubatolov, V. V. & Zinchenko, V. K & Ustjuzhanin, P. Ya.', 1],
    ['Kaila, Lauri & Karsholt, Ole & Revilla, Txema', 3],
    ['Mbata, Keith J. & Prins, Jurate De', 1],
    ['Richert, Arnold & Busse, Rainer & Theimer, Franz', 1],
    ['Sohn, J. - C., & Wu, S.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=16)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);