function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bachvarova, Darina & Vagalinski, Boyan & Doichinov, Aleksandar', 1],
    ['Brandt, Ioanne Friderico', 2],
    ['Bueno-Villegas, Julián & Sierwald, Petra', 1],
    ['Chamberlin, Ralph V.', 1],
    ['De Zoysa, H. K. S. & Nguyen, Anh D. & Wickramasinghe, S.', 1],
    ['Decker, Peter & Reip, Hans Simon & Voigtlaender, Karin', 2],
    ['Haľkova, Beata & Drabova, Martina & Mock, Andrej', 1],
    ['Hollier, John & Stöckli, Eduard & Wesener, Thomas', 2],
    ['Pocock, Reginald Innes', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=12)',
    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);