function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gu, Chang-dong & Shen, J. - w.', 1],
    ['Hanson, Mary Louise', 1],
    ['Madhavi, R.', 1],
    ['Manter, Harold W.', 1],
    ['Manter, Harold W. & Pritchard, M. H.', 2],
    ['Montgomery, William R.', 1],
    ['Moravec, František & Sey, Otto', 1],
    ['Nahhas, Fuad M. & Cable, Raymond M.', 1],
    ['Nolan, Matthew J. & Cribb, Thomas H.', 1],
    ['Sogandares-Bernal, F.', 1],
    ['Tang, Chong-ti & Tang, Zhong-zhang', 1],
    ['Wang, P. - q.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);